|Member of the Pennsylvania Senate|
from the 19th district
June 19, 2006 – November 30, 2020
|Preceded by||Bob Thompson|
|Succeeded by||Carolyn Comitta|
|Member of the Chester County|
Board of Commissioners
January 7, 1992 – June 19, 2006
|Preceded by||Patricia Moran Baldwin|
|Succeeded by||Kathi Cozzone|
|Member of the|
Downingtown Area School Board
December 1, 1975 – December 3, 1979
|Born||October 10, 1944|
|Residence||West Whiteland Township|
|Alma mater||University of Connecticut|
University of Maryland
Pennsylvania State University
Early life and education
Dinniman was born in New Haven, Connecticut. He received his BA from the University of Connecticut in 1966, and his MA from the University of Maryland in 1969. He also holds an Ed.D from Pennsylvania State University.
Early political career
Dinniman's first elected position was as a member of Downingtown school district's board of school directors. He was first elected to this position in 1975, and held the post until 1979. In 1979, Dinniman was elected chairman of the Chester County Democratic Committee, a position he held until 1985.
Pennsylvania State Senate
2006 special election
After the death of Republican Senator Robert "Bob" Thompson in 2006, Dinniman sought and attained his party's nomination to run in the ensuing special election. The special election pit Dinniman against his fellow county commissioner, Republican Carol Aichele. In what was considered a political surprise, Dinniman won with 56% of the vote, becoming the first Democrat elected to represent Chester County in the state Senate since the 1920s.
|Democratic gain from Republican|
Dinniman faced re-election in 2012. He handily defeated Chris Amentas, an East Fallowfield Township supervisor, with 57.45% of the vote.
Dinniman faced re-election again in 2016 against Republican Jack London. He handily won with 56.33% of the vote.
At the time of his retirement, Dinniman sat on five committees: Education; Communications and Technology; Agriculture and Rural Affairs; Environmental Resources and Energy; and State Government. He was the ranking Democrat on the Senate's education committee.
After initially preparing for a re-election campaign, Dinniman announced he would not seek another term and retire at the end of 2020.
Potential congressional candidacy
In 2009, the non-partisan political newspaper The Hill reported that Dinniman was "reportedly eyeing a run" for the Democratic nomination in the congressional seat being vacated by Republican Jim Gerlach, who was, at the time, running for governor. Dinniman, however, ultimately did not enter the race. He endorsed Manan Trivedi, a doctor from Reading, who went on to win the Democratic primary, but lost the fall general election to Gerlach.
- "Senator Andrew 'Andy' E. Dinniman". Project Vote Smart. Retrieved November 27, 2011. CS1 maint: discouraged parameter (link)
- Petersen, Nancy (May 18, 2011). "Chesco Senate Election Surprise". The Daily Local News. Retrieved August 6, 2010. CS1 maint: discouraged parameter (link)
- "2006 Special Election for the 19th Senatorial District". Commonwealth of PA - Elections Information. Pennsylvania Department of State. 2004. Archived from the original on 2008-11-28. Retrieved 2010-02-04.
- "State endorsements: Fuhs, Dinniman, Quigley get the nod". The Mercury. October 29, 2008. Archived from the original on January 31, 2013. Retrieved November 27, 2011. CS1 maint: discouraged parameter (link)
- "2008 General Election". Commonwealth of PA - Elections Information. Pennsylvania Department of State. 2008. Archived from the original on 2012-02-06.
- "2012 General Election". Commonwealth of PA - Elections Information. Pennsylvania Department of State. 2008.
- "2016 General Election". Commonwealth of PA - Elections Information. Pennsylvania Department of State. 2016.
- Fernandez, Cynthia. "Longtime Pennsylvania State Sen. Andy Dinniman is retiring". The Philadelphia Inquirer. The Philadelphia Inquirer, LLC. Retrieved 5 March 2020. CS1 maint: discouraged parameter (link)
- Jacobs, Jeremy P. (July 15, 2009). "Republicans could find it hard to hold on to Pennsylvania Rep. Gerlach's seat". The Hill. Retrieved July 16, 2009. CS1 maint: discouraged parameter (link)
- Kristie, Dan (August 17, 2009). "Dinniman not running for Congress". The Daily Local News. Archived from the original on February 17, 2012. Retrieved August 22, 2009. CS1 maint: discouraged parameter (link)
- Kristie, Dan (November 6, 2009). "Dinniman endorses Trivedi for 6th District". The Daily Local News. Archived from the original on January 20, 2013. Retrieved November 27, 2011. CS1 maint: discouraged parameter (link)
- State Senator Andy Dinniman official caucus website
- Senator Andrew E. Dinniman (D) official PA Senate website
- Andy Dinniman for PA Senate official campaign website
|Pennsylvania State Senate|
| Member of the Pennsylvania Senate
from the 19th district
Patricia Moran Baldwin
| Member of the Chester County Board of Commissioners