Hi Ellen,
I take it you mean the Otto who was married to Marie Sinaiberger. I'm not sure what he did for a living, but I have an idea he was a gambler, and that is why he committed suicide (in the Prater). I got this information from his niece (who is 96) - I can check it with her if you like.
But I'm curious to know - where do you fit into the Tintner tree? Are you the granddaughter of Otto (daughter of Daniel)? I found your name in the US Public Records index as "possible relative" of Daniel).
All best to you,
Tanya