Nominated by President Bill Clinton on April 23, 1993, he was confirmed by the United States Senate on August 5, 1993. During this short period of time, he was responsible for significant changes to the United Statespatent law.
After leaving the USPTO, Lehman founded the International Intellectual Property Institute, a non-profit, non-governmental organization. In 2014 he was appointed by the Secretary General of the United Nations to serve on the High Level Panel on the Feasibility of a Technology Bank for Least Developed Nations. The panel submitted its report to Secretary-General Ban Ki-moon and the United Nations General Assembly in September 2015.
In 1996 he served as the head of the U.S. delegation to World Intellectual Property Organization (WIPO) on the December 1996 Diplomatic Conference on Certain Copyright and Neighboring Rights Questions.[5]
He chairman the Working Group on Intellectual Property Rights of the National Information Infrastructure Task Force for the Clinton administration and, on September 5, 1997, was appointed, on an interim basis, as acting chairman of the National Endowment for the Humanities.[4] On June 16, 1997, he was named one of the 100 most influential men and women in Washington by the National Journal.[4]
On February 7, 2006, Lehman was honored as one of 23 inaugural inductees to the newly created International IP Hall of Fame, a project sponsored by London-based Intellectual Asset Management magazine.[6]
Lehman is president and chairman of the International Intellectual Property Institute (IIPI), a non-profit, non-partisan economic development organization based in Washington, D.C. He is also a member of the Legal Advisory Council of LegalZoom. Since 2015, Lehman has focused on advancing the cause of visual artists rights. He serves as an advisor to the Artists Rights Society of the United States and the Association of Medical Illustrators. In that capacity he has filed amicus briefs on behalf of numerous visual artists organizations with the U.S. appellate courts and the United States Supreme Court and has drafted legislation introduced by U.S. Representative Jerrold Nadler that would establish an artists resale royalty right in the U.S., patterned after similar legislation in over 70 countries. Lehman resides in Sarasota, Florida where he serves as a board member of the La Musicachamber music festival.[citation needed]