Nowak maintained a close personal and financial relationship with the financier and convicted sex offender
Jeffrey Epstein. The preface of his 2011 textbook,
Evolutionary Dynamics: Exploring the Equations of Life, ends with "I thank Jeffrey Epstein for many ideas and for letting me participate in his passionate pursuit of knowledge in all its forms." In response to the revelations of Epstein's support of Nowak and his lab (the Program for Evolutionary Dynamics), in 2021 Nowak was suspended from supervising undergraduate research for two years, and the institute was permanently closed. Harvard's review, leading to the suspension, uncovered that Epstein had maintained access to a personal office in Nowak's lab for 9 years, even after his conviction for
sex crimes, and used the office over 40 times, "typically accompanied by young women serving as his assistants". In 2023, Harvard lifted the sanctions against Nowak, and he remains on the faculty, jointly appointed in the Department of Mathematics and the Department of Organismic and Evolutionary Biology. On February 25, 2026, Harvard announced that Nowak had been placed on administrative leave from the university after a formal investigation was opened by the Faculty of Arts and Sciences. Epstein left Nowak in his
trust. ==References==