Dr. Zeniou received his Doctorate of Medicine from Creighton University School of Medicine in 1989. He has held the positions of Chief Resident in General Surgery at Stony Brook University Hospital, Director of SICU for the VA Medical Center in Northport early in his career, and Chief of General Surgery at St. Charles Hospital for several years. He achieved his Board Certification by the American Board of Surgery in 1995. He is a Fellow of the American College of Surgeons as well.

Dr. Zeniou is well versed in advanced laparoscopic surgeries such as colon resection, gallbladder removal, and hernia repair. Dr. Zeniou performs Robotic-Assisted Laparoscopic Hernia repairs, Cholecystectomies (Gallbladder), Appendectomies, and many types of complex Hernia repairs and Abdominal Wall Reconstruction. This advanced surgical approach is minimally invasive, has less postoperative pain, smaller and possibly more cosmetically appealing incisions, a shorter hospital stay, shorter recovery time and provides a faster return to work.

He is affiliated with multiple hospitals in the area including John T. Mather Memorial Hospital, St Charles Hospital, and Rehabilitation Center and St. Catherine of Siena Medical Center.