Brennan is a graduate of Nativity BVM High School.
[5][1] In 2015, Brennan was elected to represent the Second Ward on the Borough Council of Doylestown, Pennsylvania,[6] where he served from 2016 until December 2022.
[1][7] In 2018, Brennan unsuccessfully sought the Democratic nomination for the 143rd District seat in the Pennsylvania House of Representatives,[8] losing to Wendy Ullman by 55 votes.
[9] In 2022, Brennan won the election to represent the 29th District (which included much of the former 143rd[10][11]), defeating the Republican and Independent candidates.
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