Founded in 1979 by Dr. Lawrence Jehling, Clarkson has grown from a single practice on Clarkson Road in Ellisville to more than 50 locations in the St. Louis metro area. Other Locations: 1595 Denmark Rd. Union MO 63084 636-584-8989 1894 Wentzville Parkway, Wentzville, MO 63385 636-887-4000 514 Warren Cnty Shopping Cntr. Warrenton MO, 63383 636-377-2054 83 The Plaza Troy, MO 63379 636-377-2054 3071 Phoenix Center Dr. Washington, MO 63090 636-777-2345 11941 Manchester Rd. Des Peres, MO 63131 314-884-2380 100 S. Jackson St. Perryville, Mo 63775 573-547-6233 537 West Karsch Farmington, MO 63640 573-747-4133