Portrait of William P. Cannon, III

William P. Cannon, III

Managing Principal

William “Billy” Cannon is the firm’s managing principal and heads the Office of Managing Principal.  The Office of Managing Principal is responsible for the management of the firm’s Practice of Law Division, focusing on practice group management and performance, timekeeper performance and morale, cross referrals, quality assurance/quality control, marketing, and organic growth.

In addition to Billy’s Managing Principal responsibilities, his law practice focuses on the representation of property owners and property management companies in litigation, mediations, administrative agency hearings and leasing, with a special emphasis on fair housing compliance and defense of fair housing and discrimination complaints. Billy routinely provides fair housing training and frequently presents and writes on topics related to property management, Fair housing and affordable housing management. Billy has been certified in Low-Income Housing Tax Credit (LIHTC) compliance and represents many LIHTC properties and other affordable housing providers. He additionally represents sellers and purchasers in both residential and commercial transactions and litigation, including handling matters related to the District of Columbia Tenant Opportunity to Purchase Act (TOPA).

Prior to attending law school, Billy taught English at his alma mater, Gonzaga College High School, from 2001-2008. After law school, he served as a law clerk to the Honorable William P. Greene, Jr., Chief Judge of the United States Court of Appeals for Veterans Claims.

    Education

    • Catholic University of America Columbus School of Law (J.D.)
    • University of Maryland (M.F.A.)
    • Loyola University Maryland (B.A.)

    State Bar Admissions

    • Maryland
    • District of Columbia

    Professional Affiliations

    • The Barristers
    • District of Columbia Bar Association
    • Maryland Bar Association

    Recognitions

    • Influential Marylander, Daily Record, 2026
    • Named The Best Lawyers in America® for Real Estate Law (2023-2026)

Firm Highlights

  • Podcasts
    Artful Donations: Exploring Museum Exchange
    In this episode of The Legal Canvas, host Caryn Keppler welcomes Robert Wainstein and Michael Darling, co-founders of Museum Exchange, the first digital platform dedicated to facilitating art donations to museums and nonprofit institutions across North America. Together, they explore how technology is transforming the way collectors, artists, estates, and cultural organizations connect through charitable giving. Robert and Michael explain the inspiration behind Museum Exchange, the challenges they set out to solve, and how the platform has grown into a network of more than 400 museums. They walk listeners through the donation process—from evaluating artwork and matching donors with institutions to handling logistics, documentation, and tax considerations. Along the way, they discuss the realities of museum collecting, why many donations are declined, and how thoughtful placements can help preserve artists' legacies while expanding access to important works of art. The conversation also explores Museum Exchange's work with living artists, artist estates, hospitals, universities, and smaller regional museums, as well as the launch of the Charis Foundation for the Arts, a nonprofit designed to steward significant collections before placing them with institutions that can best benefit from them. Robert and Michael conclude by sharing their vision for the future of charitable art transactions and how Museum Exchange is helping reshape philanthropy in the arts for generations to come.