Ryan Deroo

Andrea E. Hammel is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Andrea E., who practices law in West Conshohocken, Pennsylvania, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Andrea E. is held by other top lawyers in the same geographic and legal practice area.

Joanne E. Matusko’s practice involves complex litigation, mass tort personal injury litigation including pharmaceutical and product liability cases, class action litigation and antitrust litigation . Education Ms. Matusko received her Bachelor of Science from Beaver College and her Juris Doctorate from the Widener University School of Law, where she received a Certificate of Achievement Award for Insurance Law and was a member of the Moot Court team. She also holds a Masters degree in B...

Bryan is a partner at the firm and has experience in counseling and representing clients on a range of environmental and energy matters. Bryan’s practice has focused on regulatory compliance and transactional matters, particularly in the areas of air and water quality, redevelopment, sustainability, permitting, energy efficiency and renewable energy development. Over the last several years, Bryan has primarily worked with complex regulated industries, notably including petroleum refinin...

Bill Conroy currently focuses his practice on the litigation of catastrophic injury cases and has devoted his practice to trial work for almost 30 years. Among other distinctions (see right), Bill is a fellow of the American College of Trial Lawyers and is featured in Chambers USA as a "Leader in his Field" nationwide for Products Liability & Mass Torts. He has represented Ford Motor Company for more than 25 years in Pennsylvania and New Jersey and has served as national trial counsel to ...

For over 30 years, partner John Livingood has defended insured and self-insured entities in casualty litigation. He represents individuals and local, regional, and national corporations in complex, high-exposure litigation throughout Pennsylvania and New Jersey. John has extensive major jury and non-jury trial experience in the Philadelphia region, having tried over 50 matters to verdict. He regularly serves as excess counsel for carriers, assuming responsibility for and trying cases anywhere...

Robert I. Friedman joined the firm’s Philadelphia office in April 2009 as a member in the Business Law Department. He serves as chair of the Private Client Services Practice Group and concentrates his practice in the areas of estate and trust planning and administration, including business succession planning, and tax and charitable planning. Robert is a fellow of the American College of Trust and Estate Counsel, and he is a member of the Advisory Committee to the Pennsylvania Joint Sta...

Peter D. Hardy is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Compliance Law, Criminal Defense: White-Collar and Tax Law. Peter D., who practices law in Philadelphia, Pennsylvania, has been recognized since 2018. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Peter D. is held by other top lawyers in the same geographic and legal practice area.

After nearly thirty (30) years of distinguished full-time practice in the area of Construction Law, Margaret Underwood is now Of Counsel to Horn Williamson. During her full-time practice of law, Ms. Underwood provided high-level legal services to local, national, and international owners, contractors, and subcontractors on many of the largest and most prestigious construction projects located in and around the Philadelphia Area and as far away as Europe and the Marshall Islands. Her extensive...

Laura M. Brooke is a top attorney recognized by Best Lawyers in the practice area(s) of Workers' Compensation Law - Claimants. Laura M., who practices law in Philadelphia, Pennsylvania, has been recognized since 2021. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Laura M. is held by other top lawyers in the same geographic and legal practice area.

John represents a broad array of clients, ranging from Fortune 500 companies to smaller closely held businesses, facing diverse environmental issues. John is co-practice leader of the firm's New Jersey practice, is a partner in the firm’s environmental litigation group, and is also regularly called upon by clients to handle site remediation matters and complex negotiations with government entities and private parties. John’s work on contaminated sediment sites and related litigati...