Stephen Stoll was born and raised in Jefferson County, Missouri. He received a Bachelor of Arts degree in political science from the University of Missouri-Columbia in 1970 and a Master of Education degree from the University of Missouri-St. Louis in 1979.

After receiving his undergraduate degree, Commissioner Stoll served in the U.S. Army, was honorably discharged and worked as a classroom teacher in Jefferson County schools. While teaching various social studies classes for 20 years, he was elected to the city council in Crystal City from 1983-1992.

In 1992, Commissioner Stoll was elected to the Missouri House of Representatives (District 103) and served three consecutive terms. He served on several committees while in the Missouri House and was the chairman of the House Elementary and Secondary Education Committee.

In 1998, Commissioner Stoll was elected to the first of two, four-year terms to the Missouri Senate. He served the 22nd District, which encompassed the northern two-thirds of Jefferson County. During his tenure in the Senate, Commissioner Stoll served on various committees, including Commerce & Environment, Local Government and Economic Development, Ways & Means and the Senate Appropriations Committee.

In 2005, then-Senator Stoll resigned his seat in the legislature to become the City Administrator of the City of Festus, Missouri – his hometown – a position he held for four years.

In May of 2009, he was named Director of Administration for Jefferson County, Missouri. He became the first director to serve under the Home Rule Charter of Jefferson County and held that position until taking the oath of office to become a Public Service Commissioner on June 4, 2012.

Commissioner Stoll serves on the NARUC Committee on Water and as the Missouri Commission’s representative on the Regional State Committee (RSC) for the Southwest Power Pool (SPP).  The Southwest Power Pool is one of the two Regional Transmission Organizations (RTO) operating in Missouri. 

Commissioner Stoll and his wife, Kathy, have four children (Emily Stoll, deceased) and five grandchildren.