L to R: Tiffany George, Linda Keely, Mindy Coretz, Julie and Libby Barrow. Things were more than “OK” in Oklahoma recently, when Julie Winkel, a USHJA certified trainer and “R” rated judge for some of the most prestigious shows in the country, taught a clinic at Farewell Farm in Bixby, Oklahoma. Farewell Farm trainer Mindy Coretz