Executives Legend
The color legend to the right illustrates the various backgrounds for the top executives in the residential real estate industry.

Mark Lowham

CEO and Managing Partner, 
TTR SIR
2025 Rank: 132
As CEO of Washington, D.C.-based TTR Sotheby’s International Realty since 2011, Lowham oversees approximately 600 agents who do nearly $4 billion in annual sales. A graduate of Stanford University, he is a second-generation real estate professional who made his first sale at the age of 19. He also serves on the executive committee for Bright MLS.

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