Lewis Butler, AIA, received his B.S. in Civil Engineering from Stanford University and his Master in Architecture from Harvard University Graduate School of Design. Prior to co-founding Butler Armsden Architects, Lewis was a member of the distinguished firm of William Turnbull & Associates in San Francisco.

Catherine Armsden earned her A.B. in Fine Arts & Art History at Brown University and her Master in Architecture from Harvard University Graduate School of Design. Before co-founding Butler Armsden with husband Lewis Butler, Catherine practiced architecture with Ripley Associates in San Francisco and Ann Beha Associates in Boston, and worked extensively in the field of historic preservation in Rhode Island, Seattle, and Boston.