State College, PA

Jonathan B. Mack

Trial lawyer Jonathan B. Mack joined the firm in 1992. He provides diligent representation to injured victims and their families throughout Pennslyvania.

Benjamin L. Costello

Benjamin L. Costello is a 1974 graduate of Ohio Northern University Pettit College of Law. He joined the firm upon graduation and became a partner, practicing primarily in workers' compensation and estates until his retirement at the end of 2020. He served as managing partner for many years and was a frequent guest speaker on workers' compensation, delivering over 120 presentations. He is recognized as a Workers Compensation litigator by Best Lawyers in America and holds an AV Preeminent rating from Martindale-Hubbell Peer Review.

Michael J. O'Connor

Founder of O'Connor Law, Michael J. O'Connor has been recognized as a Pennsylvania Super Lawyer since 2001 and a Best Lawyer by US News & World Report since 2015. He is a member of the Million Dollar Advocates Forum and has received an AV Preeminent Rating from Martindale-Hubbell. He was named Chair of the Workers’ Compensation and Workplace Injury Section at the 2010 American Association for Justice.

Robert S. Marcus

Marcus & Mack’s founder, Robert (Bob) Marcus, opened the doors of this law firm more than 40 years ago. Throughout his legal career, Bob has served as a tireless and passionate advocate for his clients. In fact, Bob’s reputation for his fearless representation has earned him continual recognition by national organizations for his skill as a personal injury attorney. Bob has been repeatedly listed as Top 100 Civil Trial Lawyer in Pennsylvania by the National Association of Trial Lawyers. He has also been recognized by the National Association of Distinguished Counsel as a member of the “Nation’s Top One Percent”. While Bob is proud of the recognition that has been bestowed upon him by his colleagues and competitors in the legal market, Bob is most proud of the culture that he has created at Marcus & Mack. Bob’s father owned a car dealership and Bob eventually took over that family business. One of the first things that Bob learned about owning a business in a small town was that great customer service is the key to staying in business. Bob brought that mentality to his law firm. Every single day, Bob stresses the importance of communicating with our clients and making sure that they know we truly have their best interests at heart.

J. Scott Leckie

J. Scott Leckie is a 1976 graduate of Dickinson School of Law, focusing primarily on Workers' Compensation with an emphasis on occupational lung diseases. He is a nationally recognized authority on Federal Black Lung law and regulations, having lectured to bar associations in several states. He served as Chairman of the Workers Compensation Section of the Pennsylvania Bar Association from 1993-1994. He is listed as a recognized Workers Compensation litigator by Best Lawyers in America and holds an AV Preeminent rating of 4.8 out of 5.0 from Martindale-Hubbell Peer Review.

Dion G. Rassias

Dion G. Rassias is a Trial Attorney recognized as a 'lawyer’s lawyer' by American Lawyer Media, with over $301 million in verdicts and settlements for catastrophically injured clients. He handles diverse legal issues including medical malpractice, professional malpractice, business disputes, defamation, product liability, and civil rights violations. His cases have been covered globally, and he has represented notable clients like Taylor Swift and Larry Holmes. Dion holds a B.A. from Stanford University and Dickinson College (1984) and a J.D. from Duquesne University School of Law (1987). He is admitted to practice in Delaware, Pennsylvania, Massachusetts, New Jersey, New York, and the District of Columbia, as well as federal courts and the U.S. Supreme Court. He served as Chair of the Disciplinary Board of Pennsylvania (2023-2024) and has been repeatedly selected as a Pennsylvania 'Super Lawyer' and 'Best Lawyer in America'.

Bryan S. Neiderhiser

Attorney Neiderhiser is a Partner at Marcus & Mack who has always taken great pride in being a personal injury attorney because his profession allows him to fight for the rights of individuals against insurance companies, businesses, and hospitals. He believes that without trial lawyers, injury victims would not have a voice against these huge companies. He feels so strongly about the importance of this profession, that he has made “giving back” a priority which resulted in his having served as the President of the Western Pennsylvania Trial Lawyers Association. That organization is devoted to promoting the right to trial by jury and to promoting the rights of injury victims. He is honored to have served as President because of the excellent work that the organization does and because he was nominated to that position by fellow trial lawyers throughout Western Pennsylvania. He earned that respect through his tireless and zealous representation of his clients for more than two decades. That hard work, drive, and determination have also resulted in his recognition as a Diplomat of the National Trial Lawyers Association; in his selection to the National Trial Lawyers Association - Top 100 Civil Trial Lawyers in Pennsylvania every year beginning in 2013; and with his recognition by the National Association of Distinguished Counsel as a member of the “Nation’s Top One Percent”. Additionally, because of the significant results that he has obtained for his clients he has also earned a lifetime membership in both the Million Dollar Advocates Forum and the Multi-Million Dollar Advocates Forum. Membership in these organizations is limited solely to attorneys who have attained million and multi-million dollar results for their clients.