Trained as an architect with a degree from University of Michigan, Ann Arbor; licenses from California and New Mexico; and certification from the National Council of Architectural Registration, the theme of Sim’s career in design, teaching and research has been applying principles of physical and social ecology to architecture and environmental design. His regenerative design solutions create environments that are resilient to human needs, place, ecology and climate.

An early innovator as California State Architect (under Gov. Jerry Brown) who introduced energy efficient design and renewable energy to California and his thirty five years as an innovator and hands- on Professor of Ecological Design at UC Berkeley, his influence on shaping the Green Architecture and Sustainable Design movement are widely recognized today.