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John O'Sullivan began their work experience in 1987 as an Auditor at Ernst & Young. In 1989, they joined RR Donnelley as a Division Director and worked there until 2002. In 2003, they started working at Crane Composites, initially as CFO until 2009, followed by Vice President of Transportation Products from 2009 to 2014. From 2014 to 2017, they held the position of Vice President of Building Products at Crane Composites. John is currently serving as the President of Crane Composites since June 2017.

John O'Sullivan obtained a Bachelor of Science degree in Accounting from Northern Illinois University, where they attended from 1983 to 1987. Later on, they pursued a Master of Business Administration with a specialization in Finance at The University of Chicago Booth School of Business, completing their studies from 1999 to 2001.