Conversation so far:
Who was Fischer's father?
Sources implying that Paul Nemenyi, a Hungarian-Jewish mathematician and physicist and an expert in fluid and applied mechanics, was Fischer's biological father.
Did Paul Nemenyl have any great achievements?
CANNOTANSWER.
What roles, besides father, does Paul play as Fischers father?
Nemenyi made monthly child support payments to Regina and paid for Bobby's schooling until his own death in 1952.
Who is Bobby's mother?
Regina.
Did Bobby  Fischer have any notable achievements?
CANNOTANSWER.

Question: Is there any other interesting information about Paul Nemenyi?
Self-contained rewrite: Is there any other interesting information about Paul Nemenyi besides from Fischer's biological father and Fluid and Applied mechanics expert?