Garth retired in 2020 from academic leadership and professional practice and now consults internationally across America and within various countries in Central Europe. His expertise is in cultural and environmental sustainability. He has built and led paradigm-changing structures and programs utilizing radical adaptive reuse, net-zero energy (or resilient interactive systems and materials), award-winning designs, and curriculum. In 1981 he co-founded MSR Design, an ongoing architecture and interiors practice in North America. He was Head of Architecture at the University of Minnesota from 1991 to 1997 and Dean of Architecture, Planning, and Preservation at the University of Maryland from 2004 to 2010. He was Visiting Professor of Architecture at Carleton University in Quebec, CA, in 2017 and MOMA in 2018/19 in Budapest, Hungary.