The Leelanau Historical Society will present a virtual program, Thursday, May 9 from 6 to 7 p.m.Thomas Henthorn, the Wyatt Professor of Public History and director of preservation studies minor at the University of Michigan-Flint.In addition to conducting research and teaching projects at Michigan cemeteries, Dr. Henthorn sits on the board of Flint’s two oldest cemeteries. He was recently…