In 2006, Gregg graduated from Central College with a B.A. in political science and history. From 2006 to 2009, he attended Drake University Law School on a full scholarship and graduated with high honors. While there, he earned the faculty's William and Ellen Cooney Hoye Award and was a junior staff member of the Drake Law Review.[2][better source needed]
Gregg was appointed by Governor Terry Branstad to serve as the Iowa State Public Defender on December 8, 2014.[6][7]
Acting Lieutenant Governor of Iowa (2017–2019)
As the previous lieutenant governor of Iowa, Kim Reynolds ascended as governor when incumbent governor Terry Branstad resigned to become United States Ambassador to China.[8][9] Due to ambiguities in Iowa's constitution and a controversial advisory opinion issued by Attorney General Tom Miller, there was some dispute regarding Reynolds' power to appoint a new lieutenant governor who would ascend as her successor if she left office prior to the expiration of Branstad's sixth non-consecutive term. To avoid the possibility of legal challenges, Reynolds appointed Gregg as acting lieutenant governor on May 25, 2017.[10] Gregg was vested with all of the duties of lieutenant governor, but not the office itself, and so was not in the line of gubernatorial succession.[11] Upon his appointment, it was reported that Gregg would be paid the salary set by Iowa law for the lieutenant governor position ($103,212).[12]
Lieutenant Governor of Iowa (2019–2024)
Reynolds selected Gregg as her running mate for a full term in the 2018 election. Gregg was sworn in as the 47th lieutenant governor of Iowa on January 18, 2019.[13][14]
Gregg resigned on September 3, 2024, effective immediately, to become president and chief executive officer of the Iowa Bankers Association.[15]