L. Thomas Hiltz graduated from Xavier University in 1967 and from the University Of Cincinnati College Of Law in 1970. He served as a First Lieutenant in the U.S. Army, Air Defense Artillery, during 1970 and 1971, after which he practiced law, having been admitted to the bar in Ohio and Kentucky. During the 1980s and 1990s he became a principal in certain businesses, primarily banking in Kentucky, Ohio and Florida. He is a member of the Boards of Directors of Applied Industrial Technologies, Inc. (NYSE: AIT), Cleveland, Ohio and of The Drees Company, Fort Mitchell, Kentucky. He is Chairman of the Boards of Trustees of the Harold C. Schott Foundation and of the Joseph J. Schott Foundation, both of Cleveland, Ohio. He is a former member of the Board of Directors of Great American Financial Resources, Inc. He is Vice Chairman of the Board of Advisers of the Institute for the Study of Diplomacy, Edmund A. Walsh School of Foreign Service, Georgetown University, Washington, D.C. He is a member of the Board of Trustees of the Cincinnati Art Museum, The Lindner Center of Hope and of The University of Cincinnati Neuroscience Center, Cincinnati, Ohio.
He is a member of the boards of the Johnny Bench Scholarship Fund, the Cris Collinsworth Foundation, the Anthony Muñoz Foundation, and Cincinnati Eyebank for Sight Restoration, and a member of the National Advisory Board of the National Underground Railroad Freedom Center, all of Cincinnati, Ohio. He is also a member of the Board of Trustees of the Muhammad Ali Museum and Education Center, Louisville, Kentucky. He is a former member of the boards of The Cincinnati Zoo and Botanical Gardens, Good Samaritan Hospital, Trihealth, Inc., Kentucky National Bank, The Camargo Hunt, the Board of Visitors of University of Cincinnati College of Law, the Cincinnati Advisory Board of U. S. Bank and former Chairman of the Sisters of Charity Ministry Foundation.
In 1995 he was inducted into The American Association of the Sovereign Military Order. He is a member of The Camargo Club, The Commercial Club of Cincinnati (Secretary, 2006–2008, Executive Committee, 2005–2008), The Ocean Reef Club, The Queen City Club (Board of Governors, 2009–2014) and of The Queen City Optimists Club (President, 2008–2009).