Our culture and mission at TTR Sotheby’s International Realty is built on three principles: integrity above all else; professional service reflecting knowledge, preparation, and innovation; and leadership in the community.

Integrity above all else

TTR Sotheby’s International Realty leads the Washington market with our highly skilled sales and marketing experts providing access and exposure to the most distinctive properties in the region and around the world. As the exclusive affiliate in the Washington metropolitan area, TTR Sotheby’s International Realty has five offices and more than 270 associates with daily interaction with our global network of more than 17,000 talented professionals. Our sales associates leverage proprietary marketing, cutting-edge digital strategies, and unrivaled access to the region’s most affluent and discerning buyers. We attract buyers who understand the global market and the Washington metropolitan region’s place at the heart of it. These buyers are well-traveled and experienced investors in luxury property. Our skill lies in presenting properties that match their exacting requirements.

Executive Team

Mark Lowham

CEO & Managing Partner

Jonathan Taylor

Founder & Managing Partner

Michael Rankin

Managing Partner

Managing Brokers

Derrick Swaak

Chief Operating Officer & Partner,
Managing Broker, McLean

David DeSantis

Partner & Managing Broker,
Chevy Chase

Deb Valainis

Managing Broker, Annapolis

Fred Kendrick

Managing Broker, Georgetown

Mary Barry

Managing Broker, Downtown

Rob Carney

Managing Broker, Arlington


Trish Yan

VP, Business Development

Heather Ewen

Senior Director, Associate Marketing

Brian Ver Straten

Creative Director

Byron Hughey

Director of Digital Media & Engagement

Penloy Bothdamirih

Marketing Associate

Michelle Leverrier

Administrative Director, Alexandria

Annie Huvane

Office Administrator, McLean

Kiley Johnson

Office Administrator, Georgetown

Mandy Conklin

Office Administrator, Annapolis

Sharon Morse

Office Administrator, Chevy Chase

Alexandra Vivas

Office Administrator, Downtown

Londi Guerra

Office Administrator, Arlington