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About Andy

Andy Dinniman has been a leader for communities, families and taxpayers for more than 40 years of public service in Pennsylvania.

That dedication and leadership led to his 2006 election and 2008, 2012, and 2016 reelections to the Pennsylvania Senate, representing Chester County in Pennsylvania’s 19th District.

Before being elected state Senator, Dinniman was elected to four terms as Chester County Commissioner (from 1992 to 2006), making him the longest-serving commissioner in county history. During that time, he made a name as a visionary and a voice for the people by incorporating local values into action and taking on some of the region’s toughest challenges.

Dinniman’s work directly resulted in the founding of the Chester County Gleaning Program (now the Chester County Food Bank) and the Safe Harbor Homeless Shelter, programs that assist some of society’s most vulnerable members.

His commitment to fiscal responsibility and economic prosperity resulted in a period of low taxes and sustained growth for both large and small businesses in the area. Dinniman has had a special concern for the development and success of the bioscience and pharmaceutical fields, encouraging entrepreneurship and innovation.

Dinniman championed investments in open space and efforts to protect our natural treasures and environmental resources. He served as one of the principal architects of Landscapes, the county’s award-winning open space plan, which has resulted in the saving of almost 30% of Chester County as open space in perpetuity.

Before serving as county commissioner, Senator Dinniman served on the Downingtown Area School Board, the West Whiteland Municipal Authority and the Board of the Chester County Conservation District.

In the Senate,  Dinniman served as minority chairman of the Education Committee, and became known as a champion of equitable education and opportunity for all students.


Dinniman resides in West Whiteland Township with his wife, Margo. Together they have a daughter, Alexis. The Dinniman family has also adopted a rescue poodle named Jagger.

Dinniman has received many awards and accolades throughout his career of public service. You can read more about them below.