What was the unlikely name of the man who designed many of the
Broadway theatres? It was something like "Krapper" or "Krapp", I kid
you not. I'd like his full name please.

Hi Rich72!

The full name of the designer is Herbert J. Krapp.

?The Broadhurst Theatre was opened in 1917 by George Broadhurst, an
Ango-American dramatist who wrote over forty plays between 1877 and
1924. The Broadhurst Theatre was opened in association with the
Shubert brothers. It was designed by Herbert J. Krapp, an architect
who was the major theatre designer of the era.?
http://www.nytix.com/Links/Broadway/Theaters/broadhurst.html


Classic movie theaters designed by architect Herbert J. Krapp
 
- Bijou Theatre 
- Boulevard Theatre 
- Forrest Theatre 
- Jackson Triplex 
- Loew's Rio 
- Loew's Woodside 
- Movieland 
- RKO Alden Theatre 
- Summit Theater 
- Sunnyside Theatre 
http://cinematreasures.org/architect/166/


Search criteria: 

Theatre Designer Krapp
://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2005-18,GGLD:en&q=Theatre+Designer+Krapp

"Herbert J. Krapp"
://www.google.com/search?sourceid=navclient&ie=UTF-8&rls=GGLD,GGLD:2005-18,GGLD:en&q=%22Herbert+J%2E+Krapp%22

I hope this is helpful. 

Best Regards,
Bobbie7

I got my answer! Thanks. It was a simple question, and a simple
answer, but you found it.