Henry Molaison

1926 - 2008

Photo of Henry Molaison

Icon of person Henry Molaison

Henry Gustav Molaison (February 26, 1926 – December 2, 2008), known widely as H.M., was an American who had a bilateral medial temporal lobectomy to surgically resect the anterior two thirds of his hippocampi, parahippocampal cortices, entorhinal cortices, piriform cortices, and amygdalae in an attempt to cure his epilepsy. Although the surgery was partially successful in controlling his epilepsy, a severe side effect was that he became unable to form new memories. A childhood bicycle accident is often advanced as the likely cause of H.M's epilepsy. H.M. Read more on Wikipedia

Since 2007, the English Wikipedia page of Henry Molaison has received more than 1,172,234 page views. His biography is available in 20 different languages on Wikipedia. Henry Molaison is the 1,054th most popular religious figure (down from 948th in 2019), the 1,954th most popular biography from United States (down from 1,637th in 2019) and the 13th most popular American Religious Figure.

Memorability Metrics

  • 1.2M

    Page Views (PV)

  • 67.09

    Historical Popularity Index (HPI)

  • 20

    Languages Editions (L)

  • 5.19

    Effective Languages (L*)

  • 2.53

    Coefficient of Variation (CV)

Page views of Henry Molaisons by language


Among religious figures, Henry Molaison ranks 1,054 out of 2,272Before him are Abraham Hyacinthe Anquetil-Duperron, Charles de Bourbon, Gudula, Fulgentius of Ruspe, Andrew Kim Taegon, and Charles III William, Margrave of Baden-Durlach. After him are Hegesippus, Saint Marcella, Eisai, Yolanda of Poland, Stanisław Dziwisz, and Jean-Marie Villot.

Most Popular Religious Figures in Wikipedia

Go to all Rankings


Among people born in 1926, Henry Molaison ranks 116Before him are Per Wahlöö, Hugo Banzer, Jean-Marie Lustiger, Galina Vishnevskaya, Thorbjörn Fälldin, and Gordon Scott. After him are Nina Kulagina, Shin Sang-ok, Jérôme Lejeune, Sergio Pininfarina, Don Rickles, and Norman Jewison. Among people deceased in 2008, Henry Molaison ranks 70Before him are Henri Cartan, Dora Ratjen, Donald E. Westlake, Leopoldo Calvo-Sotelo, Marcial Maciel, and Dorothy Vaughan. After him are Rajko Mitić, Cyd Charisse, Joseph M. Juran, Daniel Carleton Gajdusek, Saad Al-Salim Al-Sabah, and Anthony Minghella.

Others Born in 1926

Go to all Rankings

Others Deceased in 2008

Go to all Rankings

In United States

Among people born in United States, Henry Molaison ranks 1,954 out of 15,968Before him are Elijah Muhammad (1897), Jessica Alba (1981), Beau Bridges (1941), David J. Wineland (1944), Aaron Eckhart (1968), and William Lipscomb (1919). After him are Spiro Agnew (1918), Rami Malek (1981), Thomas Eakins (1844), Pat Metheny (1954), Karl Barry Sharpless (1941), and James Bond (1900).

Among RELIGIOUS FIGURES In United States

Among religious figures born in United States, Henry Molaison ranks 13Before him are Pat Garrett (1850), Joseph Franklin Rutherford (1869), Lillian Asplund (1906), Raymond Franz (1922), Paul Marcinkus (1922), and Marie Laveau (1801). After him are Madalyn Murray O'Hair (1919), Angelo Dundee (1921), William M. Branham (1909), David Wilkerson (1931), William Levada (1936), and Nathan Homer Knorr (1905).