A graduate of City College of New York, Irwin has been a Certified Public Accountant since 1949. He began his career at Apfel & Eglander CPAs in New York, departing in 1953 to found his own CPA firm. Irwin joined the New York office of GR&F in 1972. In 1977, Mr. Rennert moved to Los Angeles to co-manage the firm's west coast practice.
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His brother Ira is a billionaire and regarded as one of the worst people on the planet.