Ryan entered public service as the Lancaster County Clerk of Courts, the 56th individual to hold this position. In November 2010, Aument defeated Gerald E. Policoff in the general election to succeed
Katie True. Aument sponsored teacher evaluation legislation in his first term. The bill was ultimately signed into law as Act No. 82 in the 2011–2012 legislative session. In November 2012, Aument defeated Marcy Dubroff and retained his house seat. In the 2014 election, Aument ran for retiring
Mike Brubaker's seat in the State Senate. He defeated
Gordon Denlinger in the Republican primary, then defeated Democrat Gary J. Schrekengost in the general election. On February 9, 2021, Aument was chosen by Governor
Tom Wolf to be a part of the bipartisan
COVID-19 taskforce. As a part of this task force, Aument oversaw the establishment of a mass-vaccination clinic in his home county of
Lancaster at the
Park City Center in conjunction with local hospitals and Lancaster county commissioner Joshua Parsons. Aument is an opponent of
abortion rights. He has voted for numerous restrictions on abortion services since the beginning of his time in the Pennsylvania House of Representatives in 2011 to under the end of his career in the Pennsylvania Senate. Aument is an opponent of
LGBT rights. In 2022, he co-sponsored and voted twice in favor of a bill
banning transgender girls from participating on female sports teams. Also in 2022, he was the sponsor of the variant of a "
Don't Say Gay" bill in the Pennsylvania Senate, which would forbid any discussion of
sexual/
romantic orientation or of
gender identity in Pennsylvania elementary schools. On December 31, 2024, Aument resigned his Senate seat to become State Director to U.S. Senator
Dave McCormick. The seat was filled by
special election in March 2025, and was taken by Democrat
James Andrew Malone in what was described as a major upset (since the district is reliably Republican).
Committee assignments • Consumer Protection & Professional Licensure, Vice Chair • Appropriations • Communications & Technology • Education • Environmental Resources & Energy • Judiciary • Local Government • Rules & Executive Nominations ==Military career==