Avison Young

Harry KlaffHarry Klaff is Principal and President of Clients at Avison Young where he leads the firm’s client engagement platform and is a member of Avison Young’s Executive Committee. Harry focuses on occupier, owner, and investor engagement globally, enhancing the firm’s client service model. As President of Clients, Harry leverages the firm’s collaborative culture to build connectivity across service lines and affinity groups.

Harry joined Avison Young from JLL, where he served as an Executive Managing Director, specializing in serving the needs of occupiers. He has more than 30 years of experience in commercial real estate, structuring complex real estate transactions across several sectors, including technology, government, professional services, and financial organizations. He has completed more than $10 billion in real estate transactions globally, ranging from lease transactions, building sales, build-to-suits, and public-private partnerships. Clients have included Sallie Mae, County of Fairfax, FireEye, Thales, and Inova Health System.

Committed to his community, Harry serves on the board and executive committee of the Northern Virginia Chamber of Commerce and served as the organization’s Chairman in 2017. He also serves on the boards of Mindshare, an organization that nurtures the most promising emerging technology companies in the Washington, DC region, and the Community Foundation of Northern Virginia where Harry Chairs the Civic Leadership Committee. Harry also serves on the Board of Trustees for The Madeira School, serving as the Board’s Treasurer and Finance Chairman.

Previously, Harry was the Managing Director with Jones Lang LaSalle, specializing in Tenant Representation services. He has over 20 years of experience in commercial real estate with a track record in structuring complex real estate transactions. Over the last five years, Mr. Klaff has completed real estate transactions valued in excess of $3 billion for the region’s leading corporations, including government contractors, information technology companies, and telecommunications companies. 

Mr. Klaff received an M.B.A. in Finance from Loyola College and a B.A. in Business Administration and History from Vanderbilt University.

Community Affiliations
  • Northern Virginia Technology Council, 1998 to Present
  • CORENET, 2005 to Present
  • Mid-Atlantic Venture Capital Association
  • Medical Care for Children Partnership
    • Resource Development Chairman, 1998
    • Chairman, 1999

Mr. Klaff is married to Mary Hooper Klaff and has three daughters – Caroline (14), Madeline (13), and Lindsey (10).