Mark G. Knedeisen » Member Directory Go back to directory. Mark G. Knedeisen K&L Gates LLPPatent, Trademark, Trade Secret, Litigation Mailing Address K&L Gates Center 210 Sixth Avenue Pittsburgh PA 15222 postal Home Phone: 412-355-6342home Work Email: mark.knedeisen@klgates.comINTERNET Website: Bio Categories: Attorney Updated 2 years ago.