 Leppert credits himself with earning more profits for the company during his seven-year tenure than in the company's previous 97 years combined, and moving a related holding company headquarters (employing 15 people, including Leppert) from New York City to Dallas; Turner Construction continues to be headquartered in New York.During his career, Leppert also held positions at McKinsey & Co., Trammell Crow Company, Bank of Hawaii, and Castle & Cooke Properties, Inc.

Leppert was elected to the Board of Directors of Washington Mutual (at the time, the largest savings and loan association in the United States) in 2005; as part of his election, he was also named to the Board of Directors' Governance and Audit committees.During Leppert's time on the Board of Directors, Washington Mutual collapsed — the largest bank failure in American financial history.