His projects include the RIBA Award-winning Susie Sainsbury Theatre and Angela Burgess Recital Hall for the Royal Academy of Music,[2] Sainsbury Wellcome Centre for Neural Circuits and Behaviour, University College London[3] and the American Institute of Architects Award-winning Royal Shakespeare Company Courtyard Theatre.
He went on to research Urban Studies for a year in Oita-Osaka, Japan and graduated with a Diploma in Architecture with Distinction from PCL, London (now University of Westminster) in 1972.
[4] After working with Norman Foster (1972–76), Ritchie spent two years in France designing and constructing projects before joining Arup's Lightweight Structures Group.
[9] Before he left RFR in 1990, the practice had been responsible for major projects in Paris including the Bioclimatic Facades at La Villette Cité des Sciences and the Louvre Pyramids and Sculpture Courts with I M Pei.
He has acted in an advisory and teaching capacity to government, universities and charitable trusts, and regularly lectures on topics including art, urbanism and regeneration at venues worldwide.