Before embarking on his legal career, Mr. Gremminger practiced as an engineer which allowed him to develop a unique skill-set with experiences working in an ammunition manufacturing research facility, coal mines and at a power plant. He also prepared design drawings and technical specifications for HVAC and pipeline distribution systems.

After joining GGM 40 years ago, Gary demonstrated superior ability in effectively representing corporations, insurance companies and individuals in lawsuits arising from alleged failure to maintain premises and motor vehicle/trucking accidents as well as design/construction related claims. His technical background and engineering experience also assisted in the representation of manufacturers and distributors in cases involving alleged product defects. Gary successfully handled many catastrophic injury and wrongful death claims.

Mr. Gremminger’s practice has since evolved to providing services as a Mediator.  Gary’s experience in litigating and resolving disputes and his relationships with counsel on both sides enable him to bring matters to a conclusion by compromise through non-binding mediation.  To date, Gary has assisted parties in the resolution of more than 900 cases.

Gary oversees a group of experienced attorneys and has developed a national self-insured client base, representing a number of the largest employers throughout Pennsylvania and New Jersey, including several Fortune 500 companies, in retail, transportation, school districts, support services and pharmaceuticals.  In addition, he represents national insurance carriers and third-party administrators.

He represents clients in workers’ compensation matters at all levels of administrative and appellate proceedings.  Gary often visits a workplace to become familiar with the conditions and to conduct an investigation of witnesses and supervisors.  He makes every effort to engage the appropriate expert witnesses at an early stage in the litigation so that hearings and depositions may be promptly completed without unnecessary continuances and delays.

Gary regularly represents clients in disputes involving sex, age and race discrimination, sexual harassment, retaliatory discharge, defamation, breach of employment contracts and tortious interference with contracts.  He is actively involved in providing advice to clients on the rapidly changing legal landscape in this area, and in handling a broad spectrum of employment law claims, including compliance with statutes such as ERISA, COBRA, and the Americans with Disabilities Act.  Gary frequently assists clients with the drafting and implementation of various employment policies.

He has been a member of ALFA International, The Global Legal Network, for over 20 years.  He  was appointed to ALFA’s Board of Directors and Executive Committee in 2009 and served as Chairman of the National Workers’ Compensation Practice Group and as Editor for the National Workers’ Compensation Compendium for the States of Pennsylvania and New Jersey.  Gary has been a featured speaker in many ALFA International seminars including the 2006 ALFA International Client Seminar focusing on Employment and the 2008 ALFA International Workers’ Compensation Seminar “Empowering Claims”.  Gary was appointed course book editor and speaker for ALFA International 2009 International Client Seminar on Global Labor & Employment topics.  Gary was acting Editor for ALFA International’s Labor and Employment Program, Acceptable Risks:  The Intersection of Insurance Law, Business & Employment.”  He presented at the 2009 ICS program “Global Labor and Employment Law:  A Business View with A Legal Eye.”  Gary’s panel of National Employers’ addressed:  “The Employer’s Right to Information – In the US and Abroad.”  At the Fall 2009 ALFA National Workers’ Compensation program, Gary and a panel of experts addressed “Strategies for Dealing with Employees Who Lose Their Jobs.”

Gary has been elected to Pennsylvania Super  Lawyers from 2011 to 2022.

Dean earned his  pre-medical degree in 1970 and his juris doctor in 1974.Thereafter, he practiced with and became a partner in the Philadelphia law firm of LaBrum & Doak. In 1980, he became one of the founding members of German, Gallagher & Murtagh, P.C., where he practices today. Dean focuses his practice almost entirely in the defense of medical malpractice and products liability cases, and catastrophic injury cases of all types. He has represented hospitals and individual physicians in all areas of medicine, including neurosurgical, neurological, orthopedic, obstetrical, gynecological, oncological, anesthetic, gastroenterological, radiological, general surgical, emergency medicine and nursing matters. He has also represented physicians in administrative hearings involving licenses, privileges and credentials. Dean also has often been chosen to act as a mediator in medical and product liability matters.

Dean, a Fellow of the American College of Trial Lawyers, lectures at seminars presented by the Defense Research Institute, the Pennsylvania Defense Institute, the Federation of Insurance and Corporate Counsel, the American Law Firm Association, the Florida Spine Institute and the National Hand Symposium for Orthopedic Surgeons and Physical Therapists. He has been qualified as an instructor on risk management to the Medical Associations of many states for Continuing Medical Education Credits.

His legal presentations have included the examination of physicians in soft tissue injury cases, the use of MRI and CT scans in previously asymptomatic plaintiffs, physician exposure and the National Practitioner Data Bank, causation in products liability cases, jury selection issues and bad faith/good faith claims practices. These lectures have resulted in publications in those same areas.

In his practice, Mr. Sumner represents employers and their insurers in all aspects of workers’ compensation matters throughout Pennsylvania and New Jersey.

Mr. Sumner is a 2009 graduate of Drexel Law, where he was a member of the inaugural class and a founding member of the Law Review.  Mr. Sumner also earned a degree concentration in Business and Entrepreneurship Law.

Prior to joining GG&M, Mr. Sumner worked for a firm in Montgomery County concentrating on Workers’ Compensation and employment matters.