Simons was chief of the Federal Trade Commission's competition bureau from 2001 to 2003. He was a partner at Paul, Weiss, Rifkind, Wharton & Garrison LLP. Simons is also a co-developer of “Critical Loss Analysis,” a technique for market definition that has been incorporated into the Department of Justice and FTC Merger Guidelines, as well as applied in numerous court decisions.[1]
On October 19, 2017, the White House announced that President Donald Trump would nominate Simons to be chairman of the Federal Trade Commission.[2] He took office on May 1, 2018, and was scheduled to depart on January 29, 2021; he was replaced as chair on January 21.[3]
Notably, the FTC under Simons filed an antitrust lawsuit against Facebook in December 2020.[4]