Bill Warwick More about Bill Warwick Bill Warwick, AIA, NCARB: As a Principal of BartonPartners, Bill’s 25 years at the firm have been focused on multifamily development, planned communities, active adult, traditional neighborhood development, and urban infill. He serves on the NAHB 55+ Housing Council, and, for the last several years, has been a judge for their BALA, Pillars of the Industry and 55+ Award Programs. Last year, Bill was inducted to the Carpenters Company of Philadelphia, formed in 1724, this is the oldest existing craft guild in North America. Bill is also an active Chester/Delaware County HBA Member.