Jonathan L. Swichar

A graduate of the University of Pennsylvania and its law school, Marc Jonas is co-chair of the firm's Land Use and Zoning practice group. He has extensive experience in real estate, land use, municipal law, and zoning matters, representing individuals, businesses, institutions, non-profit organizations and municipalities. Marc has practiced land use and real estate law for more than 30 years. In his career, Marc has appeared as counsel in Pennsylvania state and federal courts in matters invol...

Christopher A. Tinari concentrates his practice in the representation of management in labor and employment matters. Chris maintains a national practice of representing employers in all aspects of labor and employment law including sexual harassment, race, national origin, disability and age discrimination cases, wrongful discharge, defamation, slander, and other state law and constitutional claims. As an active litigator, Chris has extensive experience in handling a variety of complex litiga...

Kaitlyn R. Maxwell is a top attorney recognized by Best Lawyers in the practice area(s) of Environmental Law and Litigation - Environmental. Kaitlyn R., who practices law in Philadelphia, Pennsylvania, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Kaitlyn R. is held by other top lawyers in the same geographic and legal practice area.

Patrick M. McKenna has extensive experience representing numerous municipalities, zoning hearing boards, municipal authorities, and planning commissions in Chester and Delaware Counties. In addition, he advises and guides private land owners and developers through complex commercial land development matters, from acquisition and planning, through the permitting and land development phases. He has represented clients on matters including townhome developments, senior care homes, national fast-...

Steven E. Angstreich is a trial attorney with more than 50 years of experience representing individuals, businesses, and classes of plaintiffs in complex litigation matters. Based in Philadelphia, Pennsylvania, he serves clients through Weir LLP in a wide range of commercial , environmental , consumer, and professional liability disputes. His practice includes Legal Malpractice Law - Plaintiffs, as well as class action litigation , business litigation, toxic torts, and fiduciary litigation. M...

Marni Sabrina Berger is a top attorney recognized by Best Lawyers in the practice area(s) of Personal Injury Litigation - Plaintiffs. Marni Sabrina, who practices law in Philadelphia, Pennsylvania, has been recognized since 2024. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Marni Sabrina is held by other top lawyers in the same geographic and legal practice area.

David J. Colleran is a top attorney recognized by Best Lawyers in the practice area(s) of Medical Malpractice Law - Plaintiffs, Personal Injury Litigation - Plaintiffs and Product Liability Litigation - Plaintiffs. David J., who practices law in Philadelphia, Pennsylvania, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which David J. is held by other top lawyers in the same geographic and legal practice area.

The Honorable Geoffrey W. Dlin (ret.) has returned to private practice and joined KK &O after serving more than 15 years as a Workers' Compensation Judge. As a judge, he decided thousands of contested workers' compensation cases and frequently taught other lawyers, judges and private organizations about workers' compensation matters. In addition to those traditional roles of a judge, Geoff developed a statewide mediation practice. His skills in settling workers' compensation cases were hi...

Lester E. Lipschutz concentrates his practice on sophisticated estate and tax planning for high net worth families, including the preparation of wills and trusts, insurance planning, family limited partnerships, defective grantor trusts, grantor retained annuity trusts, residence trusts, asset protection planning, generation-skipping planning, dynasty trusts and the preparation of prenuptial agreements. He also assists clients with business succession planning, including shareholders’ a...

Elliott R. Feldman is a top attorney recognized by Best Lawyers in the practice area(s) of Commercial Litigation. Elliott R., who practices law in Philadelphia, Pennsylvania, has been recognized since 2020. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Elliott R. is held by other top lawyers in the same geographic and legal practice area.