ST. LOUIS, Mo. – Mackey Mitchell Architects announces the promotion of two senior team members.
Greg Frankenfeld (LEFT), AIA, and Andrew Gilles (RIGHT), AIA, LEED AP, have been promoted to principal.
Frankenfeld serves as one of the principal leaders in Mackey Mitchell’s Dallas office. With 34 years of
experience in architecture and project management, he is recognized for his strategic mindset, collaborative
leadership and deep understanding of complex project dynamics. Since joining the firm in 2008, Frankenfeld has guided
numerous award-winning projects while cultivating strong, respectful partnerships with clients, consultants and
colleagues.
Gilles has been with Mackey Mitchell for eight years and brings more than 23 years of design expertise to the principal role. His portfolio spans healthcare, laboratory, research and higher education environments. Known for his innovative use of 3D visualization and immersive design tools, Gilles empowers
clients to explore ideas and make informed decisions throughout the design process. His experience across
planning, design and construction administration gives him a comprehensive perspective on the built
environment.