DeWit received his degree in business administration and finance from the University of Southern California, and began his career in 1992 at Smith Barney Shearson.

DeWit won the Republican primary in August, defeating former Tempe Mayor Hugh Hallman and former state party Chairman Randy Pullen by a large margin.

[5] He said in 2016 that he had no plans to seek reelection at the end of his term as State Treasurer as he disliked the "favor-factory" mentality of established politicians, whose ranks he had no desire to join.

[6] DeWit was nominated by President Trump to become Chief Financial Officer of the National Aeronautics and Space Administration on December 1, 2017.

[17] After the release of the audio recordings, Lake insisted DeWit should resign from his position in the Arizona Republican Party.

DeWit complied, claiming Lake's team threatened to release another incriminating audio recording if he didn't.