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

As the exclusive Sotheby’s International Realty affiliate for the Washington Metropolitan Region, TTR Sotheby’s International Realty engages daily with a global network of 21,000 real estate professionals. Through proprietary marketing technology, cutting-edge digital strategies, and unrivaled access to the region’s most affluent and discerning buyers, TTR Sotheby’s International Realty attracts clients who are well-traveled, who are experienced in luxury real estate investing, and who understand Washington’s unique position at the heart of global culture and commerce.

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

Marcus Jaffe

Managing Broker, Alexandria


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 Beauchamp

Office Administrator, McLean

Kiley Johnson

Office Administrator, Georgetown

Mandy Conklin

Office Administrator, Annapolis

Sharon Morse

Office Administrator, Chevy Chase

Alexandra Vivas

Office Administrator, Downtown

Minnie Wodatch

Office Administrator, Arlington