In 2007, Tim Quinlan took over all day-to-day operations of Quinlan Development Group and is directly responsible for all aspects of the company. During his tenure he has invested in, developed, or is developing over one million square feet of new projects. Tim also oversees the family's legacy portfolio and the leasing and management affiliate Walker, Malloy and Company, Inc.

Prior to joining Quinlan Development Group, Tim worked as SLCE Architects, Cushman & Wakefield, Tommy Hilfiger, and at a startup technology company. He graduated from Trinity College in Hartford, Connecticut with a Bachelor of Arts in American Studies, and received a Master of Science in Real Estate from New York University.

Tim serves on the boards of Open House New York, Downtown Brooklyn Partnership, and Columbus Avenue Business Improvement District. He was involved in the foundation of the Junior Committee for the High Line, and assisted the Park Avenue Armory in starting its Avant-Garde program. He is a Member of the New York Farmers, the Urban Design Forum, New York Landmarks Conservancy, and Chairman of Friends of Coleman Station Historic District. Tim also actively supports several other non-profits.