While at Rider College in 1972‑1973, John was hired by the Office of Public Defender in Trenton as a part time assistant investigator. Upon graduating from Vermont Law School, he was accepted as Law Clerk to the Honorable Herman Belopolsky, J.C.S., Honorable Harold B. Wells, III, A.J.S.C. and Honorable W. Thomas McGann, J.C.S.

Upon passing the Bar in New Jersey in 1976, he joined the firm of Mathews and Sitzler as an associate and was made partner the following year.

In 1979, John became Solicitor for the Wrightstown Borough Planning Board as well as Municipal Prosecutor for Pemberton Township. Over the next few years John became a Solicitor for the Delran Township Planning Board as well as Municipal Prosecutor for many municipalities including Hainesport, Cinnaminson, Pemberton, Mount Holly, New Hanover, and Springfield.

In 1990, he and his father, John O. Sitzler, Jr., formed the partnership of Sitzler and Sitzler and in 1995 became the Sole Proprietor of Sitzler and Sitzler when his father became of counsel to the firm.

From 2000-2013 John taught as an adjunct Professor of Law at Widener University School of Law. Wilmington, Delaware campus and taught Alcohol, Vehicle, and the Law, one of the most popular courses at Widener.

From 2007-2014, John was nominated by his peers as the Top Attorney to work with on DWI defense cases for SJ Magazine. He was also voted as Top DUI attorney by the public for South Jersey Magazine for the years 2010-2014.

Bar Admissions
  • New Jersey, 1976
  • U.S. District Court District of New Jersey, 1977
  • U.S. Supreme Court
  • Vermont Law School, South Royalton, Vermont ‑ 1976
  • Rider College
    • B.A. ‑ 1973
    • Major: Political Science
  • Certified Alcotest Operator

Convicting Intoxicated Drivers in Complex Cases February 2009
Technical and Scientific Defenses in Aloctest Case May 2009
Overcoming the Crawford Challenge July 2009
Defending an Ethics Case August 2010
Alcotest Round Table May 2011
Field Sobriety Tests at Trial May 2011
New Court Rules August 2011
Beat the Machine September 2012
Common R/E Ethics Issues November 2012
New & Successful DWI Defense November 2012
Boardwalk Seminar, April 2013
New Jersey DWI Blood Cases, May 2013
Missouri v. McNeely May 2013
New Gun Laws in New Jersey, September 2013
DWI Mock Alcotest Trial, December 2013
SFST& Blood Testing, May 2014
RPC’s for Attorneys, September 2014
Arrest, Search, and Seizure, October 2014
Search and Seizure October 2014
Ethical Challenges Part I, November 2014
Search and Seizure Review September 2015
Vacating a DWI Conviction October  2015
It’s only a DUI case…What Could Go Wrong? – Top DUI Mistakes – Speaker December 2016
The History of Closing Arguments in American Cinema – Speaker December 2016
Cross Examination of SFT Evidence March 2016
Criminal Justice Reform / Central Judicial Processing Court April  2016
The Important New Bail Law for New Jersey: Why Your Client Cannot Get of Out Jail
April 2016
Municipal Court Spring Review June  2016
Ethical Emails – A Law Firm Policy July 2016
Municipal Court Review – Summer – Instructor July 2016
Theodore Roosevelt and the Progressive Era August 2016
DWI Double Jeopardy June 2017
Immigration Law September 2017
Supreme Injustice November 2017
Revisiting Younger’s 10 Commandments December 2017

  • Shining the Light on SFST’s in Court
  • Blood Evidence in DWI Cases: Mastering the Science
  • Lecture speaker for continuing legal education classes
  • National Association of Criminal Defense Lawyers “Big Easy Cross” New Orleans, LA
Honors & Awards
  • SJ Magazine, 2007‑2014, John was voted top DUI attorney by his peers
  • South Jersey Magazine, 2010-2017, John was voted top DUI attorney by the public
Professional Associations and Memberships
  • Burlington County Bar Association
  • Ocean County Bar Association
  • Gloucester County Bar Association
  • Atlantic County Bar Association
  • Camden County Bar Association
  • New Jersey State Bar Association
  • American Trial Lawyers Association
  • National Criminal Defense Lawyers Association
  • National College of DUI Defense
  • Faculty at Garden State CLE
  • Adjunct Professor Widener University School of Law 2000-2013
Past Employment Positions
  • Sitzler and Sitzler, Sole Proprietor, 1995 ‑ Present
  • Sitzler and Sitzler, Co‑Founder and Partner, 1990 ‑ 1995
  • Weishoff and Sitzler, Partner, 1987 ‑ 1990
  • Mathews, Sitzler, Weishoff and Sitzler, Partner, 1983 ‑ 1987
  • Mathews and Sitzler, Partner, 1977 ‑ 1983
  • Mathews and Sitzler, Associate, 1976 ‑ 1977
  • Hon. W. Thomas McGann, J.S.C., Hon. Herman Belopolsky, J.S.C., Hon. Harold B. Wells, III, A.J.S.C., Law Clerk, 1976 ‑ 1977
  • New Jersey Office of the Public Defender in Trenton, Investigator (Part time),
  • Pemberton Township, Municipal Prosecutor,
  • Hainesport Township, Municipal Prosecutor,
  • Cinnaminson Township, Municipal Prosecutor,
  • New Hanover Township, Municipal Prosecutor,
  • Springfield Township, Municipal Prosecutor,
  • Wrightstown Borough Planning Board, Solicitor,
  • Adjunct Professor of Law Widener School of law 2000 to 2013