 In 2014, Williamson received the AIA's Edward S. Frey Award for career contributions to religious architecture.He is the recipient of AIA Memphis' 2017 Francis Gassner Award for outstanding contributions to the quality of the built environment in Memphis.Williamson is also the recipient of the 2017 William Strickland Lifetime Achievement Award, the highest honor that AIA Tennessee can bestow on an individual, in recognition of a significant body of work having a lasting influence on the theory and practice of architecture.