On April 17, 2023, the Board of Directors of U.S. NeuroSurgical Holdings, Inc. unanimously appointed Mr. William St. Lawrence, age 53, as a non-executive director of the Company's Board, effective immediately. Mr. St.

Lawrence has served a director of Sonic Foundry, Inc. since May 2021 and the General Counsel and VP of Business Development at Cayster, Inc., a dental technology company, since August 2019. Prior to joining Cayster, Mr. St. Lawrence served from February 2017 to August 2019, as the General Counsel and then interim CEO at Northern Power Systems (TSX), a VT-based renewable energy company.

From September 2012 to December 2020, Mr. St. Lawrence was General Counsel/Chief Admin Officer and then Advisor for Northeast Wireless Networks, a wholesale shared access cellular networks company acquired by AT&T in September 2018. Mr. St.

Lawrence serves as an advisor and consultant to a variety of technology and other companies. Mr. St. Lawrence has a B.A. in History from Hobart and William Smith Colleges and a J.D. from the University of Maine School of Law.