About David Mark
David Mark Landay earned his J.D. from Duquesne University School of Law in 1978 after completing a B.S. in Civil Engineering and Engineering and Public Policy at Carnegie Mellon University in 1975. Those two degrees set a clear tone for his professional life: technical training paired with legal study. The combination is uncommon and it shapes how he looks at problems.
Landay has practiced in Pennsylvania for many years. His career spans several decades, beginning after law school and continuing into the present day. Over that time he has worked on matters that require both legal analysis and an understanding of technical detail. He approaches cases methodically and places an emphasis on the factual and engineering aspects that can influence legal outcomes.
His background in civil engineering and public policy informs his legal work. That education gives him a different lens when cases involve construction, infrastructure, regulatory compliance, or technical disputes. He tends to probe records and reports closely and to situate legal issues within the framework of policy and technical standards. Colleagues describe his approach as precise and grounded in documentation rather than rhetoric.
Professionally, he holds membership in the Pennsylvania State Bar and remains engaged with the legal community there. He participates in professional activities that keep him connected to developments in state law and practice. That membership reflects his long-standing presence in the Pennsylvania bar and his ongoing work on cases in the state.
Outside of formal credentials and memberships, Landay’s profile is defined by the intersection of law and engineering. He values clear explanations and practical solutions. Clients and peers who work with him encounter a lawyer who can translate technical details into legal arguments. He maintains an active legal practice in Pennsylvania, drawing on both his legal training and his engineering background in the matters he handles.
