Lowham was recently named chairman of the Washington, DC-based TTR Sotheby’s International Realty. Lowham is a second-generation real estate professional who made his first sale at 19. In his previous role as the firm’s CEO — a position he held for 15 years — Lowham oversaw about 650 agents who do approximately $4.5 billion in annual sales. In 2025, TTR SIR acquired HRLS Partners, a move that increased the company’s DC-area office count to 13.