Reigle was appointed as CEO of the championship in September 2019, replacing Formula E co-founder Alejandro Agag, who moved into the position of chairman.
Reigle joined Formula E having held executive positions at Manchester United and Los Angeles Rams, and during his three-and-a-half-year spell has overseen the growth of the all-electric championship.
This also included ensuring the championship stayed afloat during the COVID-19 pandemic, as well as when manufacturers Audi, BMW and Mercedes all left the category in the space of a year.
His tenure also included the addition of new venues on the calendar, including Hyderabad, Cape Town and Sao Paulo for the 2023 season.
His departure was announced to Formula E staff on Tuesday morning, where he confirmed that he would "remain as an advisor through the end of the year" and that he will support the soon-to-be-announced new CEO through the coming months.
In an internal message, Reigle said: "When I was offered the opportunity to lead Formula E, one of my mentors said that my primary objective should be to leave the company in a better place than when I started.
Source: Autosport