Peter grew up in the City of Brookfield. His father was a police chief for 28 years and then served eight years as an Alderman, while his mother was a Waukesha County Supervisor for twenty years. He attended the University of Wisconsin- Milwaukee, and received a Bachelors Degree in Business Administration with a minor in Communications. He graduated from Marquette University Law School.

For ten years, Peter was a law enforcement officer with the City of Brookfield Police Department. In addition to his regular patrol duties, Peter was a DARE Instructor, and he was chosen to be an Instructor to teach OWI procedure and Standardized Field Sobriety Testing to other police officers. Peter also served undercover as a Detective with the Waukesha County Metropolitan Drug Enforcement Unit. 

As an attorney, his practice Wolff & Sonderhouse, LLP focuses on criminal, family, and civil litigation, and he was appointed Special Court Commissioner to the Honorable Mark Gundrum.  Peter was first elected to the Waukesha County Board in 2006.

Peter is very active in the community, serving on the Board of Directors for the Waukesha County Fair, and as trustee of the Bridges Federated Library Board.  He is President of the Board of Directors of the 180 Diversion Program. Peter is a volunteer Judge for the New Berlin Teen Court. Peter is a member of the Waukesha County Bar Association, with membership in Criminal, Family, and Juvenile sections. He is also admitted to the Eastern District of Wisconsin Bar Association, and he is a member of the Wisconsin Association of Criminal Defense Lawyers.