- Passed Stage Technical Master exam (1949)
- Passed Stage Lighting Master exam (1950)
- Apprenticeship, City of Dresden, GDR (1945-1949)
- National Opera Theatre, Saxony, German Democratic Republic (1950-1953)
- Technical Director; Hagen, Weisbaden and Cologne Operas (1953-1971)
- Technical Director and Production Director; Staatsoper, Munich (Bavarian National Opera House) (1971-1992)
Editor, Buhnentechnische Rundshau (1977-1997?) Editor’s note: This is the oldest technical theatre periodical in the world, published continuously since 1907.
USITT and OISTAT involvement and offices held:
- OISTAT Founding Member (1968)
- Chair, OISTAT programming committee (1974-1978)
- President, OISTAT (1978-1997)
- Series of Master Classes throughout the U.S. for Universities and USITT Sections (1973)
- German Association of Theatre Technicians (DThG): Member (since 1966); Member of the Board of Directors (1968-1983); President (1976-1983)
Awards and Honors:
- Elected USITT Fellow (1997) Editor’s note: Mr. Grosser is the only non-member to ever be accorded this honor.
- USITT Special Citation (1985)
- Honorary Medal of the Federal Republic of Germany
- OISTAT Gold Pin (1997)
- Silver Honorary Medal of the DTHG
- Holder of the Linnebach Gold Ring
- Editor’s note: Within the German theatre world the most significant honor is to be the bearer of the legendary Linnebach Gold Ring. This artifact is a special tribute passed from the most outstanding Technical Director of each generation to a successor of the next generation and is passed down only in the final will of the current holder.