Adam Grant, the author, is a professor of organizational psychology at the Wharton School of the University of Pennsylvania. A Michigan native, Grant earned his BA from Harvard College before going on to earn his PhD from the University of Michigan. He began his career at the University of North Carolina before accepting a faculty position at the University of Pennsylvania, where he became the college’s youngest tenured professor at just 28 years old.

Grant is the author of several books on organizational psychology as well as numerous academic papers, and as he discusses in Think Again, frequently consults with large companies on organizational and psychological problems. In addition to his academic work, he is the host of the WorkLife podcast and an entrepreneur. He is also on the board of the Lean In Foundation, the organization founded by Sheryl Sandberg, with whom Grant coauthored Option B (2017).

Tómasdóttir is a former presidential candidate in Iceland. Grant introduces Tómasdóttir in Chapter 2, in which he argues for confident humility as a means of counteracting blind spots and overconfidence. In 2015, Tómasdóttir was urged to run for the presidency. However, despite her previous successes and experience, and her current support, Tómasdóttir was initially reluctant to run because she felt she wasn’t qualified enough.