Missions The Sukuma people in Tanzania in the Serengeti. The Maasai people in Kenya. Dr. Hagen treating a Maasai mom and child. Dr. Hagen checks a Tanzanian mom and child. Dr. Hagen's dental clinic in the middle of a field in Tanzania. A classroom becomes a dental clinic in the Maasai Mara. Maasai mom with a toothache to be fixed! A dental clinic in an open field in the Maasai Mara. There are no cows in Dr. Hagen's office in Leander.