From 2002 to 2009, Prokopiak served as a supervisor in Falls Township, Bucks County, Pennsylvania.
Out of a field of three candidates,[3][7] Prokopiak was unanimously chosen by the party's executive board.
[3] He defeated Republican candidate Candace Cabanas in the February 2024 special election.
[8] Prokopiak is pro-choice and supports codifying abortion rights into the Pennsylvania Constitution.
Prokopiak and his wife, Gail Humphrey,[11] have three children and reside in Levittown, Pennsylvania.