John Guilliams More about John Guilliams John Guilliams has been designing innovative and successful homes and communities for over 25 years. He is a Partner at KGA Studio Architects, PC in Louisville, Colorado, where he leads the firm’s award-winning Production Design Studio. Having worked for some of Colorado’s most reputable design firms specializing in multi-family, land planning, and residential architecture, John combines his vast experience and technical knowledge in a team approach for his long-standing client base. John is a member of the Urban Land Institute and a board member of the NAHB’s Design Committee and Sustainability Green Home Building Subcommittee.