Greg Keller, D.O., is a board-certified psychiatrist who provides care to patients in the Atlantic Medical Center. Originally from Cedar Rapids, Iowa, Dr. Keller completed his undergraduate studies at the University of Montana, earning a bachelor’s degree in Cellular Molecular Biology.  He received his Doctor of Osteopathic Medicine degree from the University of Health Sciences College of Osteopathic Medicine in Kansas City. Dr. Keller then completed his general adult psychiatry residency through the Creighton University and University of Nebraska combined training program, where he earned multiple awards, including Resident of the Year.

Dr. Keller is board-certified by the American Board of Psychiatry and Neurology.

Cyndi Wu is a dually certified as a Psychiatric-Mental Health Nurse Practitioner (PMHNP) by the American Nurses Credentialing Center and a Family Nurse Practitioner by the American Association of Nurse Practitioners. She graduated with her Bachelor of Science in Nursing from Clarkson College in 2007, her Master of Science, Family Nurse Practitioner from Clarkson College in 2014, and her PMHNP from the University of Cincinnati in 2026.