of Clarkston, formerly of Gaylord and Lake Orion, passed away peacefully on June 16, 2016 at 80 years of age. Beloved husband of Nancy for 57 years. Dear father of Lee Adair, Natalie (Ronnie) Yeargin, Carole (Andrew) Jeffery, Christie Adair and Hugh (Jennifer) Adair. Loving grandfather of Jessica, Holly, Justin and Derek Adair, Cody and Jeff Yeargin, Patrick, Kelli and Adam Fisher and Katelyn, Kristopher, Kaylee and Kaden Adair. Dear Great Grandfather of Courtney and Collin Johnson. Uncle of Sallie (Steve) Keehn, David (Mary) Adair and Tracy (Steve) Austin. Predeceased by his parents Albert and Charlotte Adair and his brother William Bryant Adair. Leonard was retired from GM after 34 years of service.