Carol Ann Susi (February 2, 1952 -- November 11, 2014) was an American actress. She was known for providing the voice of recurring unseen character Mrs. Wolowitz, mother of Howard Wolowitz, on the television series The Big Bang Theory.

Based on this passage, who is the actress that plays howard wolowitz mother? Let's give stream of consciousness first:
To answer the question, consider the following: She was known for providing the voice of recurring unseen character Mrs. Wolowitz, mother of Howard Wolowitz, on the television series The Big Bang Theory.
So, the final answer is Carol Ann Susi.