| 1971 - Present | In private practice as Principal of Martin Holub Architects & Planners |
| 1970 - 71 | Senior Project Designer with Kahn & Jacobs Architets, New York City |
| 1968 - 69 | Project Designer with Richard Seifert & Partners, Architects, London, England |
| 1967 - 68 | Designer with architectural branch of the Greater London Council London, England |
| 1962 - 67 | Designer with architectural office of state-owned building contractor Konstruktiva, Prague, Czechoslovakia |