Senator Dinniman has been a leader for communities, families and taxpayers through 30 years of public service in Pennsylvania.

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

Dinnimanwelcome1Before 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 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, while consistently standing up for individual property rights and against eminent domain.

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 serves as minority chairman of the Education Committee and is a member of the following committees:

  • Agriculture and Rural Affairs
  • Environmental Resources and Energy
  • Public Health and Welfare
  • State Government

He is an active member of the Ben Franklin Technology Development Authority and the Joint Legislative Air and Water Pollution Control and Conservation Committee. He also serves on the state Board of Education, the Education Commission of the States, the state Public School Building Authority and the Pennsylvania Higher Educational Facilities Authority.

Dinniman resides in West Whiteland Township with his wife, Margo. Together they have a daughter, Alexis.