John Herbst, DO John Herbst, DO, is a neuro-oncologist with AHN Cancer Institute, specializing in diagnosis and treatment for cancers of the neurological system. He is skilled at Ommaya tap, lumbar puncture, and intrathecal chemotherapy. Dr. Herbst went to medical school at Lake Erie College of Osteopathic Medicine in Erie, Pennsylvania. He did his residency at Geisinger Medical Center in Danville, Pennsylvania. Upon completing his residency, he did a fellowship in neuro-oncology at Memorial Sloan Kettering Cancer Center in New York, New York. He is certified by the American Board of Psychiatry and Neurology and is also affiliated with the Society for Neuro-Oncology and American Academy of Neurology. Dr. Herbst welcomes patients ages 18 and older.