| 1963 | Registered architect, New York State. |
| 1964 | Member, American Institute of Architects (currently inactive). |
| 1965 | Certified by US National Council of Architectural Registration Boards (NCARB) for registration in any US state. |
| 1970 | Registered by ARCUK (later, ARB) as an architect for practice in the United Kingdom. |
| 1972 | Became member, Royal Institute of British Architects. |
| 1992 | Became member, Academy of Experts. |
| 1992 | Associate, Chartered Institute of Arbitrators (became full member 1999). |
| 1996 | Became member, Society of Expert Witnesses. |
| 1999 | Became member, Chartered Institute of Arbitrators. (I resigned my institute membership in 2010.) |
| 2005 | Accredited by the RIBA as Client Design Advisor—representing user needs when others appoint architects. |
| 2007 | Accredited by the RIBA as Chartered Architect. |