Courtney . She has been practicing with Dr. Grellner in Cushing since 2003. She received her Bachelor’s of Science in Nursing from the University of Oklahoma Health Science in 2002. She then earned her Masters of Science in Nursing as a FNP from Vanderbilt University in Nashville, TN. Courtney works primarily at Cushing Primary Care. In addition, she sees patients part-time at Pipeline Urgent Care.