William K. Mattar is an American entrepreneur and attorney. He is the president and owner of William K. Mattar, P.C.—a personal injury law firm, based in Williamsville, New York, that focuses on auto injury car accidents. The firm serves clients throughout New York State and has additional intake offices in Rochester, Syracuse, and Albany, New York.

William was born in 1963 in Buffalo, New York. In 1986, he completed his Bachelor of Science degree in psychology at the State University of New York at Plattsburgh. He then attended the Syracuse University College of Law, where he earned his Juris Doctorate in 1988—achieving his childhood dream of becoming a lawyer. William and his wife, Kathleen, have three children and currently reside in New York. He also has a dog named l'eau.


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