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Reared in Indiana and Florida, Leininger attended Indiana University, where he received a Bachelor of Arts in 1965 and an M.D. in 1969. Following a two-year internship at the Leonard M. Miller School of Medicine at the University of Miami, he completed post-graduate courses at the Center for Disease Control in Atlanta, Brooke Army Medical Center in San Antonio, Walter Reed Army Institute of Research in Washington, D.C., and Fort Sam Houston in San Antonio, where he also lectured. He later settled in San Antonio and taught at the University of Texas Health Science Center from 1972-1973.
In 1976, Leininger founded Kinetic Concepts, a global medical technology corporation, on whose board he later served as Chairman Emeritus.Other business ventures have included forming private venture investment firm MedCare Investment Funds in 1991, co-founding ATX Technologies in 1994 (later serving on its board of directors), and co-founding the Renal Care Group in 1995. He has served as director for the Emergency Department of the Baptist Health System in San Antonio (1975-1986) and on the board of directors for Texas Commerce Bank (1985-1991). He currently sits on the boards of BioNumerik Pharmaceuticals and Spurs Sports & Entertainment.
Leininger has also invested in Texas real estate and food companies, such as Promised Land Foods, Sunday House Foods, Seafood Wholesalers of Houston, and Plantation Seafood Co. He owns direct mail firm Focus Direct, Inc. and television station Mission City Television, Inc. Additionally, he is part-owner of the San Antonio Spurs.
Leininger founded Texans for Justice in 1988, the Texas Public Policy Foundation in 1989, and has been involved with Texans for Governmental Integrity. He supported Thomas R. Phillips' campaign for Chief Justice of the Texas Supreme Court and has made significant donations to George W. Bush (while governor of Texas), retiring Texas Governor Rick Perry, and the Republican Party of Texas.
On the local level, Leininger's political action committees were involved in the narrow victory of Hispanic Republican Nathan Macias to the Texas House of Representatives in 2006. Macias unseated the more moderate lawmaker Carter Casteel of New Braunfels in the Republican primary for House District 73. However, Macias was himself narrowly upset in the 2008 primary by the more moderate Doug Miller, who still holds the Comal County seat just north of San Antonio.
Leininger is a devout Christian and has been described as "an extremist," a label he himself describes as "sad." He sits on the board of Patrick Henry College, founded in Virginia by the conservative activist Michael Farris. A proponent of school vouchers, Leininger launched CEO San Antonio to award vouchers to children from modest backgrounds. He also sits on the board of directors of CEO America, another school voucher organization. He is a former board member of the Carver Academy. He owns the copyright for The Beginner's Bible, as well.
In addition to political contributions, Leininger supports a range of charitable initiatives in areas including education, humanitarian aid, and scientific research. In 1997, he reportedly donated $1.5 million to Vanderbilt University, $3 million to the University of Miami, and $300,000 for diabetes research to the University of Texas Medical Center. Other recipients include Boy Scouts of America, Habitat for Humanity, the American Red Cross, the Mental Health Association, the Young Men's Christian Association, The Miracle Foundation, along with orphanages in India, Romania, Central America, Haiti, Ukraine, Russia, Myanmar, Thailand, and 13 countries in Africa.
Married in 1976, Leininger and his wife, Cecelia, have four children and five grandchildren.