I. Martin "Marty" Isaacs is a group theorist and representation theorist and professor emeritus of mathematics at the University of Wisconsin–Madison.^[1][2][3][4] He currently lives in Berkeley, California and is an occasional participant on MathOverflow.^[4]

Isaacs completed his Ph.D. from Harvard University in 1964 under Richard Brauer.^[5][6] From at least 1969 until 2011, he was a professor at the University of Wisconsin–Madison. In May 2011, he retired and became a professor emeritus.^[1][2][3][4] The Mathematics Genealogy Project lists him as having had 29 doctoral students.^[6]

Isaacs is most famous for formulating the Isaacs–Navarro conjecture along with Gabriel Navarro, a widely cited generalization of the McKay conjecture.^[7][8]

Isaacs is famous as the author of Character Theory of Finite Groups (first published in 1976), one of the most well-known graduate student-level introductory books in character theory and representation theory of finite groups.^[9][10][11]

Isaacs is also the author of the book Algebra: A Graduate Course (first published in 1994; republished in 2009),^[12] which received highly positive reviews.^[13] Additionally, he is the author of Finite Group Theory (published in 2008).^[14][15][16]

Isaacs is a professor emeritus at the University of Wisconsin–Madison.^[1] He retired in 2011.^[3]

In 2009, a conference was held at the Universitat de Valencia in Spain to honor his contributions.^[17]

Isaacs is also a Fellow of the American Mathematical Society.^[18]

Isaacs was a Pólya lecturer for the Mathematical Association of America. He received the Benjamin Smith Reynolds award for teaching engineering students at the University of Wisconsin and a UW Madison campus teaching award. He was also the recipient of a Sloan Foundation research award.