Marc Robert Steinberg has been the Managing Partner of Rubin, Glickman, Steinberg and Gifford since 1980, and has been a member of the firm since 1976. He has been litigating civil and criminal cases in Federal and State Courts for over 44 years, and actively continues to do so. Mr. Steinberg is the only attorney in Bucks or Montgomery County certified as a Criminal Trial Attorney by the National Board of Trial Advocacy and recognized by the Supreme Court of Pennsylvania. He graduated from Temple University School of Law in 1973, and holds an undergraduate degree from Pennsylvania State University. Mr. Steinberg is a former Montgomery County Assistant District Attorney. He is Past President of the Montgomery Trial Lawyers Association and the Montgomery American Inn of Court, which he helped organize and start. He is Past President of the Montgomery Bar Association, the Montgomery Bar Foundation and the Montgomery County Trial Lawyers Association. He sat as a Director of the Pennsylvania Association of Criminal Defense Lawyers (PACDL). He completed six years as a member of the Supreme Court of Pennsylvania Disciplinary Board Hearing Committee 2.09, the last year as chairman. Since 1997, he has served as a Civil Discovery Master for the Montgomery County Court of Common Pleas. He is a co-founder of the Criminal Defense Law Committee of the Montgomery Bar Association and served as its chairman or co-chairman from 1988 until 1996. Mr. Steinberg sits on the House of Delegates of the Pennsylvania Bar Association from Zone 9. He is a frequent lecturer for the Pennsylvania Bar Institute and the Montgomery Bar Association in criminal and civil areas. For 25 years, he taught Trial Advocacy at the Beasley School of Law at Temple University teaching law students the art of trial advocacy. Mr. Steinberg served as a Committee Member on the Pennsylvania Joint State Government Commission Advisory Committee on Wrongful Convictions.

Mr. Steinberg is the Immediate Past President of the Board of Directors of the Montgomery Child Advocacy Project (MCAP), a non-profit corporation which provides free legal services to abused and neglected children involved in court cases, which he helped start in 1999.

In 2005, he was named the Trial Lawyer of the Year by the Montgomery Trial Lawyers Association.

Marc Steinberg is the lawyer other lawyers call when they have a problem.

Since 2004, he has been named one of Pennsylvania’s "Super Lawyers" by a poll of his peers as published in Philadelphia Magazine, and he has been named as one of the Top 100 Lawyers in Philadelphia and Pennsylvania. From 2010 – 2017, he was named a "Best Lawyer in America" as published in Philadelphia Magazine by The Best Lawyers in America, and also named a Best Lawyer by U.S. News and World Report from 2010 – 2018. He was named a Top 10 Criminal Defense Attorney in the Commonwealth of Pennsylvania by the National Academy of Criminal Defense Attorneys.

Mr. Steinberg also enjoys the prestigious "AV" rating from Martindale-Hubbell.