The table on this page offers what is intended as a complete or near-complete listing of Dr. Leonard Peikoff's public speeches, lectures and courses. (College and university courses are deliberately excluded. Content not delivered in the presence of a public audience, such as broadcasts and podcasts, are also not listed here.) The vast majority of the material from 1970 onwards was recorded and most of that is available at present for playback in homes and on personal playback devices. For links to specific works on specific platforms, users should consult https://objectivistmedia.com/speakers/leonard-peikoff. This table has drawn data from the ObjectivistMedia web site. (This accounts for some presentations made without a live audience present appearing in this table; where ObjectivistMedia included such content, it was not excised here.) Where the present page offers a benefit over the ObjectivistMedia site is in allowing for each comparisons of the different running times of the same works at different platforms. To understand the comparisons, one needs to know how to interpret the columns in the table.
The columns of the table are:
1) "title" — this is generally unambiguous. A few works came to be known under other titles following the original delivery of the speech or lecture course. Where this is the case, the table or end notes provides relevant information.
2) "presenters other than Peikoff" — this usually will be blank, but in a few instances there were other presenters
3) "venue" — abbreviations are used for organizations for which Peikoff spoke often: NBI was Nathaniel Branden Institute; FHF is Ford Hall Forum; TJS was Thomas Jefferson School or The Jefferson School (the name changed); CC was Conceptual Conferences; SRC was Second Renaissance Conferences
4) "date" — in cases of lecture courses, dates shown are for that of the first lecture
5) "# of parts" — this should be read as the number of lectures in a course; where blank, the reader should assume a single lecture
6) "e-Store length" — this refers to media obtainable from the Ayn Rand Institute's e-Store at estore.aynrand.org
7) "CD length" — this refers to the running time of an edition offered on compact disc
8) "ARI Campus length" — This refers to the length of the version streamable at the Ayn Rand Institute's Campus subsite, located at
https://courses.aynrand.org/campus-courses/. ARI Campus sometimes combines multiple individually-given lectures into one set, such as fourteen Peikoff talks delivered at Ford Hall Forum grouped as one set (one "course") which cumulatively contain 1229 minutes of audio. In the case of this Ford Hall Forum set, the lectures are listed here individually and the times shown in the "ARI Campus" are the individual-lecture lengths retrieved from the ARI Campus web page for the "course"; however, some other sets may not have been given this override in the preparation for the table below.
9) "YouTube length (total)" — where only one video is on YouTube for a given complete work, that length is shown. Where a work is divided into multiple files on YouTube, the number shown in this column is the length of all of the files combined. For the user's convenience, the end notes below the table show the breakdowns of various lectures into the lengths of their separate parts
10) "YouTube parts" — This lists the number of separate videos which cumulatively make up a complete course, in the case of courses offered on YouTube. In some cases, this will be different from the number of lectures given separately in the original live presentation. This occurs when ARI chose to upload to YouTube (and to Campus) a revamped version wherein one or more long lectures are each divided into two or more parts so that end points occur after the completion of a subject which did not fill one entire lecture.
11) "P.Libr. length" — this refers to the Peikoff Library web site. Presence of a number in the data cell indicates availability of the title on the site, with the number indicating the length in minutes; this column follows the same pattern as with the e-Store, CD, ARI Campus, and YouTube editions.
12) "other notes" — where "SEE NOTE" appears in this column, there are details given in the end notes below the table. The user should seek the desired title (in boldface) in the end notes below the table.
| title | presenters other than Peikoff |
venue | date | # of parts | e-Store length |
CD length |
ARI Campus length |
YouTube length (total) |
YouTube parts |
P.Libr. length |
other notes |
| History of Ancient Philosophy | NBI | May 24, 1962 | 10 | ||||||||
| The History of Modern Philosophy | NBI | Jun 16, 1964 | 13 | ||||||||
| Ayn Rand's Concept of Egoism | Stanford University | May 16, 1965 | 1 | ||||||||
| The Ethical Philosophy of Ayn Rand | Ayn Rand Study Group of the University of Colorado | May 10, 1966 | 1 | ||||||||
| The Metaethics of Objectivism | Mensa Denver Group | May 12, 1966 | 1 | ||||||||
| Contemporary Philosophy | NBI | Jun 30, 1966 | 10 | ||||||||
| Objectivism's Theory of Knowledge | NBI | Oct 7, 1966 | 10 | ||||||||
| Logic and Reality | Brooklyn College Students of Objectivism | Dec 14, 1966 | 1 | ||||||||
| University of Pennsylvania in Philadelphia | Apr 14, 1967 | 1 | |||||||||
| San Francisco Ayn Rand Society | Apr 20, 1967 | 1 | |||||||||
| The Immorality of Altruism | University of Colorado in Boulder | Apr 18, 1967 | 1 | ||||||||
| Certainty Without Omniscience | Ayn Rand Society at the University of Virginia (Charlottesville) |
Apr 28, 1967 | |||||||||
| Logic: Who Needs It? | Callahan-Shulman Lectures | Jul 16, 1967 | 1 | ||||||||
| Modern Philosophy | NBI | Jan 7, 1968 | 14 | ||||||||
| Introduction to Logic [not recorded] |
NBI [see 1974 listing for recorded version] |
Mar 4, 1968 | 10 | ||||||||
| The Metaethics of Objectivism | University of Texas in Austin | Apr 17, 1968 | 1 | ||||||||
| Nazism and Contemporary America: The Ominous Parallels | NBI | Apr 25, 1968 | 3 | ||||||||
| Principles of Definition | Detroit Society for Students of Objectivism | Jun 29, 1969 | 1 | ||||||||
| Modern Philosophy: Kant to the Present | Peikoff Lectures | Sep 24, 1970 | 12 | 1896 | 2198 - merged, truncated as "History of Philosophy" |
2242 | 50 (merged courses) |
1889 | SEE NOTE | ||
| Founders of Western Philosophy: Thales to Hume | Peikoff Lectures | Sep 14, 1972 | 12 | 2002 | 1992 | SEE NOTE | |||||
| Introduction to Logic | Peikoff Lectures | Jan 15, 1974 | 10 | 1619 | 1613 | 1611 | 10 | 1613 | SEE NOTE | ||
| The Philosophy of Objectivism | Peikoff Lectures | Sep 14, 1976 | 12 | 1950 | 1946 | 1932 | 1931 | 12 | 1926 | SEE NOTE | |
| Ayn Rand's Concept of Selfishness | Univ of Penn., Phila. | Feb 1978 | |||||||||
| The Philosophy of Objectivism [repeat course; this occurrence not recorded] | Peikoff Lectures | Sep 12, 1978 | |||||||||
| The Philosophic Basis of Capitalism | 1980 | 93 | 93 | 98 | |||||||
| Objective Communication | Peikoff Lectures | Feb 19, 1980 | 10 | 1523 | 1506 | 1504 | 10 | 1518 | SEE NOTE | ||
| Principles of Grammar | Peikoff Lectures | Oct 13, 1981 | 8 | 1142 | 1139 | 1138 | |||||
| The Sanction of the Victims | FHF 1982 | Apr 25, 1982 | 80 | 79 | 79 | 79 | |||||
| Understanding Objectivism | Peikoff Lectures | Oct 4, 1983 | 12 | 1573 | 1544 | 1544 | 12 | 1566 | SEE NOTE | ||
| Assault from the Ivory Tower: Professors' War on America | FHF 1983 | Apr 24, 1983 | 73 | 73 | 73 | 73 | |||||
| The Ominous Parallels | TJS 1983 | Aug 06, 1983 | 8 | ||||||||
| Capitalism versus Socialism: Which is the Moral Social System? | Gerald Caplan, John Ridpath, Jill Vickers | Debate 1984 | Jan 26, 1984 | 141 | |||||||
| The American School: Why Johnny Can't Think | FHF 1984 | Apr 15, 1984 | 90 | 89 | 89 | 89 | |||||
| The Role of Philosophy and Psychology in History | TJS Regional LA 1984 | Sep 15, 1984 | |||||||||
| TJS Regional NY 1984 | Oct 06, 1984 | 83 | 83 | 82 | |||||||
| TJS 1985 | Jul 28, 1985 | 83 | 83 | 80 | |||||||
| Medicine: The Death of a Profession | FHF 1985 | Apr 14, 1985 | 86 | 85 | 85 | 85 | |||||
| Philosophy of Education | TJS 1985 | 1985 | 6 | 508 | 410 | 431 | 4 | 505 | SEE NOTE | ||
| Objectivism: A Question and Answer Session | TJS 1985 | Jul 28, 1985 | 57 | 1 | |||||||
| A Rational Curriculum | TJS Regional 1986 | 1986 | 87 | 89 | |||||||
| Can Capitalism Survive? | 1986 | 53 | 58 | ||||||||
| Religion vs. America | FHF 1986 | Apr 20, 1986 | 81 | 80 | 80 | 80 | |||||
| My Thirty Years With Ayn Rand: An Intellectual Memoir | FHF 1987 | Apr 26, 1987 | 81 | 85 | 81 | 80 | 81 | ||||
| Objectivism: State of the Art | TJS 1987 | Aug 02, 1987 | 8 | 701 | 689 | 690 | 8 | 697 | SEE NOTE | ||
| Why Should One Act on Principle? | FHF 1988 | Apr 24, 1988 | 91 | 91 | 90 | 91 | |||||
| Certainty and Happiness: Achieving Success in Thought and Action | CC 1988 | Jul 30, 1988 | 161 | 165 | 113 | 121 | 159 | SEE NOTE | |||
| The Logical Structure of Philosophy | TJS Regional LA 1988 | Sep 17, 1988 | |||||||||
| TJS Regional NYC 1988 | Oct 29, 1988 | ||||||||||
| The Carl Wiglesworth Show with guest Leonard Peikoff | The Carl Wiglesworth Show | Jan 30, 1989 | |||||||||
| Certainty and Happiness: Achieving Success in Thought and Action | FHF 1989 | Apr 23, 1989 | 161 | 113 | 121 | ||||||
| Moral Virtue | TJS 1989 | Aug 06, 1989 | 3 | 397 | 378 | 4 | 395 | SEE NOTE | |||
| Questions and Answers on Objectivism | |||||||||||
| The Philosophic Foundations of Objectivism | CC 1990 | Jun 30, 1990 | 10 | 1527 - merged as "Advanced Seminars on OPAR" |
1007 | 9 | 1567 - merged as "Advanced Seminars on OPAR" |
SEE NOTE | |||
| Objectivism: The Philosophy of Ayn Rand | TJS 1991 | Aug 04, 1991 | 6 | 520 | 6 | SEE NOTE | |||||
| Philosophy and the Real World Out There | FHF 1990 | Dec 02, 1990 | 90 | 89 | 89 | 89 | |||||
| Some Notes About Tomorrow | FHF 1992 | Apr 26, 1992 | 93 | 93 | 93 | 93 | |||||
| The Art of Thinking | CC 1992 | Jun 27, 1992 | 8 | 871 | 867 | 867 | 8 | 867 | SEE NOTE | ||
| Interview with Leonard Peikoff | Ray Briem | KIEV radio, Los Angeles | 1992 | 34 | |||||||
| Seven Great Plays as Philosophy and Literature | TJS 1993 | Jun 27, 1993 | 8 | 1107 - merged as "Eight Great Plays" |
1062 - merged as "Eight Great Plays" |
1062 (950 + 112) |
9 (8 + 1) | 1089 - merged as "Eight Great Plays" |
SEE NOTE | ||
| Cyrano de Bergerac | SRC 1994 | 1994 | 1 | ||||||||
| Modernism and Madness | FHF 1993 | Nov 07, 1993 | 94 | 93 | 93 | 93 | |||||
| An Objectivist Question Period | Harry Binswanger, Peter Schwartz | IRM 1994 | Jul 16, 1994 | ||||||||
| Reading and Writing | IRM 1994 | Jul 16, 1994 | 4 | 225 | 225 | 222 | 2 | 223 - as "Writing: A Mini-Course" |
SEE NOTE | ||
| What to Do About Crime | FHF 1995 | Apr 23, 1995 | 1 | 101 | 101 | 101 | 101 | ||||
| How To Be Emotional in Making Choices but Not Emotionalist | Lyceum 1995 | Aug 12, 1995 | 239 - merged as "Judging, Feeling and Not Being Moralistic" |
237 - merged as "Judging, Feeling and Not Being Moralistic" |
237 - merged as "Judging, Feeling and Not Being Moralistic" |
||||||
| How To Be Judgmental but Not Improperly Condemnatory | Lyceum 1995 | Aug 12, 1995 | |||||||||
| Introduction to Objectivism | Lyceum 1995 | Aug 12, 1995 | 78 | ||||||||
| A Philosopher Looks at the O.J. Verdict | FHF 1996 | Apr 23, 1996 | 90 | 89 | 89 | 89 | |||||
| Introduction To Objectivism | IRM 1996 | Jun 29, 1996 | |||||||||
| Why Businessmen Need Philosophy | IRM 1996 | Jun 29, 1996 | |||||||||
| Unity In Epistemology And Ethics | IRM 1996 | Jun 29, 1996 | 4 | 427 | 420 | 399 | 4 | 425 | SEE NOTE | ||
| Lyceum Euro 1997 | May 30, 1997 | 2 | 427 | 420 | 399 | 4 | SEE NOTE | ||||
| Triumphs and Tribulations of a Talk-Show Host (a.k.a., My Experience As a Radio Talk-Show Host) | Lyceum 1997 | Aug 09, 1997 | 73 | 71 | 72 | ||||||
| The State of the Economy | John Allison, Yaron Brook, Richard M. Salsman | Lyceum 1997 | Aug 09, 1997 | ||||||||
| The Survival Value of Great (Though Philosophically False) Art | Lyceum 1997 | Aug 09, 1997 | 103 | 102 | 102 | ||||||
| Love, Sex, and Romance | Love, Romance, and Sex - A Valentine's Weekend Getaway 1998 | Feb 13, 1998 | 99 | 99 | |||||||
| Objectivism Through Induction | Objectivism Through Induction Tele-Seminar | Feb 26, 1998 | 12 | 1091 | 1094 | 1093 | 12 | 1089 | SEE NOTE | ||
| A Picture is Not an Argument | FHF 1998 | Nov 22, 1998 | 98 | 97 | 97 | 97 | |||||
| The Leonard Peikoff Show: Live from Summer 99 | Lyceum 1999 | Jul 09, 1999 | |||||||||
| Poems I Like—and Why | Lyceum 1999 | Jul 12, 1999 | 183 | 182 | 2 | 182 | SEE NOTE | ||||
| The One In the Many: How to Create It and Why | FHF 2001 | Apr 09, 2001 | |||||||||
| Integration as the Essence of Personal Identity | IRM 2001 | Jul 07, 2001 | 2 | ||||||||
| Induction in Physics and Philosophy | SRB 2002 Palo Alto | Aug 10, 2002 | 796 | 794 | 688 | 6 | 793 | SEE NOTE | |||
| America vs. Americans | FHF 2003 | Apr 06, 2003 | 90 | 90 | 89 | 89 | 89 | SEE NOTE | |||
| ARI Event 2003 America vs. Americans | Apr 21, 2003 | 90 | 90 | 122 | |||||||
| The Axioms of Induction | OCON 2003 | Jul 05, 2003 | 2 | ||||||||
| Induction Through Experimentation: Galileo | OCON 2003 | Jul 05, 2003 | |||||||||
| Centenary Reminiscences of Ayn Rand (Irvine) | (Mary Ann Sures was scheduled, but didn't appear) | Ayn Rand Centenary (Irvine) | Feb 02, 2005 | 76 | 75 | 75 | |||||
| Why Ancient Greece is My Favorite Civilization | 2006 | 34 | 34 | 34 | 34 | ||||||
| The DIM Hypothesis | OCON 2007 | Jul 06, 2007 | 6 | 578 | 575 | 575 | 6 | SEE NOTE | |||
| Cultural Commentary Q & A | OCON 2008 | Jun 28, 2008 | 72 | 72 | |||||||
| The DIM Hypothesis: The Epistemological Mechanics by which Philosophy Shapes Society | Leonard Peikoff's DIM Hypothesis Seminars | Jan 15, 2010 | 15 | 1351 | |||||||
| The DIM Hypothesis II | OCON 2010 | Jul 02, 2010 | 6 | 549 | 542 | 543 | 6 | SEE NOTE | |||
| Q&A with Leonard Peikoff | OCON 2012 | Jun 30, 2012 | SEE NOTE | ||||||||
| Student Q&A on "The DIM Hypothesis" | ARI DIM Hypothesis Q&A 2012 | Oct 16, 2012 | 67 | ||||||||
| Ideal - Q&A with Leonard Peikoff | OCON 2014 | Jun 28, 2014 | |||||||||
| A Message from Leonard Peikoff | OCON 2018 | Jun 29, 2018 | 34 | ||||||||
| Celebrating Leonard Peikoff | Carl Barney, Andrew Bernstein, Razi Ginzberg, Ellen Kenner, Lisa VanDamme | London Ayn Rand Meetup ARC-UK | Oct 15, 2020 | ||||||||
| Viennese Operetta: My Virtual Reality | Leonard Peikoff's Last Lecture: Viennese Operetta | Jul 31, 2021 | 86 | ||||||||
| 20 Years Since 9/11: ARI's Distinctive Philosophic Analysis | Yaron Brook, Onkar Ghate, Edwin A. Locke | New Ideal Live | Sep 08, 2021 | 68 |
Modern Philosophy: Kant to the Present
[e-Store time length is for both philosophy courses together; lengths in parenthesis show this course first, followed by companion course.]
[Course also known as "History of Philosophy Part 2." The edition of "History of Philosophy" offered on ARI Campus and YouTube is an edited compilation of History of Philosophy parts 1 and 2, wherein the original multi-hour lectures were divided into shorter units devoted to isolated subjects. Sections on some modern philosophers are omitted from these versions, so persons interested in those subjects must turn to the full-length versions of the lectures (available from the e-Store and in the earlier audiocassette and CD publications).]
Founders of Western Philosophy: Thales to Hume
[e-Store time length is for both philosophy courses together; lengths in parenthesis show this course first, followed by companion course.]
[Course also known as "History of Philosophy Part 1." The edition of "History of Philosophy" offered on ARI Campus and YouTube is an edited compilation of History of Philosophy parts 1 and 2, wherein the original multi-hour lectures were divided into shorter units devoted to isolated subjects. Sections on some modern philosophers are omitted from these versions, so persons interested in those subjects must turn to the full-length versions of the lectures (available from the e-Store and in the earlier audiocassette and CD publications).]
Introduction to Logic
[Individual lectures on YouTube are these lengths, in order: 143 + 162 + 163 + 162 + 169 + 155 + 165 + 166 + 166 + 160]
The Philosophy of Objectivism
[Individual lectures on YouTube are these lengths, in order: 147 + 163 + 164 + 162 + 165 + 160 + 164 + 157 + 159 + 155 + 169 + 166]
[The standard presentation of this 1976 course from the time it first was made available for sale (previously, the course was contracted to lessees who played recordings to audiences who paid admission to hear the tapes) has each lecture begin with a post-1976 statement which starts, "This is Leonard Peikoff speaking in the Fall of 1990. ..." The remarks last 1 min. 30 secs. The presentation on the MP3 files available from the Peikoff Library web site consign the Fall 1990 remarks to a separate MP3 file. Each 1976 lecture begins at the beginning of its own MP3 file, without the Fall 1990 prefatory addition. Thus, the Peikoff Library version lacks eleven repeats of the 1½ minutes of tacked-on preface. When comparing the 1926-minute total running time of the Peikoff Library edition to the lengths of the other editions, the 16½ minutes of omitted repeat introduction should be computed into the comparison.]
[Individual lectures of Peikoff Library recordings are these lengths, in order: 146 + 163 + 163 + 162 + 164 + 159 + 163 + 156 + 158 + 155 + 170 + 166 (the separate preface recording is excluded from this list)]
Objective Communication
[Individual lectures on YouTube are these lengths, in order: 154 + 156 + 155 + 155 + 136 + 144 + 154 + 154 + 149 + 147]
Understanding Objectivism
[The 12 lectures on YouTube don't align with the original 12, in that the original lecture 11 was withdrawn from the set after the course ceased to be offered on a lessee-playback basis. I surmise that lectures 5 and 6 herein were split from the original lecture 5, with YouTube lectures 7-11 corresponding to the original lectures one number prior (thus, 6-10).]
[The time figure for the e-Store download shown here has been corrected from the ObjectivistMedia figure, which states 133 mins (the running time of just the first lecture).]
[Individual lectures on YouTube are these lengths, in order: 132 + 140 + 143 + 148 + 55 + 85 + 141 + 138 + 138 + 144 + 137 + 143]
Philosophy of Education
[Peikoff delivered 6 sessions at the conference at which this course was given: five devoted to prepared material, and one session entirely of Q&A. The second YouTube lecture, at 162 minutes, was originally two lectures. The Q&A session has been consigned to a
separate YouTube video apart from the "Philosophy of Education" series.]
[Individual lectures on YouTube are these lengths, in order: 84 + 162 + 100 + 85]
Objectivism: State of the Art
[Individual lectures on YouTube are these lengths, in order: 90 + 84 + 87 + 71 + 100 + 87 + 86 + 85]
Certainty and Happiness: Achieving Success in Thought and Action
[The CD set is divided in this way: Disc 1: lecture, Disc 2: Q&A from CC 1988; Disc 3: Ford Hall Forum Q&A.]
Moral Virtue
[Individual lectures on YouTube are these lengths, in order: 97 + 68 + 110 + 103]
[The last segment of the e-Store recording features the general Q&A.]
The Philosophic Foundations of Objectivism
[This 1990
course was combined with a 1991 course to form "Advanced Seminars on OPAR."]
[Individual lectures on YouTube are these lengths, in order: 109 + 111 + 114 + 115 + 113 + 112 + 114 + 111 + 108]
Objectivism: The Philosophy of Ayn Rand
[This 1991 course was combined with a 1990 course to form "Advanced
Seminars on OPAR."]
[Individual lectures on YouTube are these lengths, in order: 75 + 87 + 88 + 86 + 93 + 91]
The Art of Thinking
[Individual lectures on YouTube are these lengths, in order: 113 + 113 + 113 + 64 + 122 + 114 + 113 + 115]
Seven Great Plays as Philosophy and Literature
[Course was retitled and
expanded as "Eight Great Plays" with the addition of
Peikoff's lecture "Cyrano de Bergerac"]
[ARI Campus, e-Store and YouTube lengths are based on the set of nine lectures, wherein Peikoff's 1994 "Cyrano" lecture was bundled with his 1993 course
"Seven Great Plays as Philosophy and Literature."]
[Individual lectures on YouTube are these lengths, in order: 143 + 103 + 114 + 126 + 116 + 116 + 121 + 111 + 112]
[The course was adapted as the book "Discovering Great Plays: As Literature and as Philosophy," which became an unabridged audio book downloadable from downpour.com (division of Blackstone Audio), running 830 minutes.]
Reading and Writing
[Individual lectures on YouTube are these lengths, in order: 108 + 114]
Unity In Epistemology And Ethics
[Same lengths as 1997 course with similar title, but number of parts different]
[Individual lectures on YouTube are these lengths, in order: 96 + 81 + 107 + 115]
Unity in Epistemology and Ethics
[Individual lectures on YouTube are these lengths, in order: 96 + 81 + 107 + 115]
Objectivism Through Induction Tele-Seminar
[Individual lectures on YouTube are these lengths, in order: 86 + 91 + 95 + 91 + 94 + 93 + 90 + 92 + 101 + 86 + 83 + 91]
Poems I Like—and Why
[Individual lectures on YouTube are these lengths, in order: 92 + 90]
Induction in Physics and Philosophy
[Individual lectures on YouTube are these lengths, in order: 91 + 98 + 126 + 128 + 117 + 128]
America vs. Americans
[One YouTube version is both audio and video, with Q&A, and runs 122 minutes rather than the 89 minutes of the other.]
The DIM Hypothesis
[Individual lectures on YouTube are these lengths, in order: 86 + 99 + 99 + 97 + 94 + 100]
The DIM Hypothesis II
[Individual lectures on YouTube are these lengths, in order: 85 + 90 + 85 + 96 + 90 + 97]
Q&A with Leonard Peikoff [at OCON 2012]
[This session was divided up into segments issued as episodes of Peikoff's podcast series.]
This page prepared by David P. Hayes, 2025