Leslie Griesdorf Dentist Leslie Griesdorf Dentist Toronto Leslie Griesdorf, a retired dentist, loves history. He even collects media information about history. There is just so much to know, that Leslie Griesdorf will often leave the History channel on throughout the day. Despite living in Canada, he spends much of his time learning United States history. One of Leslie Griesdorf’s admitted obsessions is the life of former President John F. Kennedy.