Dr. Omer Engin is an Associate Professor of General Surgery at Health Sciences University, Tepecik Training and Research Hospital, Surgery Department, Turkey. He has authored many international articles, chapters, and congress papers and has served as a book editor for internationally published books and as an organizing committee member in a number of international conferences. He is an Organisation Scientific Committee Member in the International Medical Society Scientific Committee and Athens Institute for Education and Research. He serves as an editorial board member and as a reviewer in several international medical and surgical scientific journals. His specializations are: endocrine surgery, hepatobiliary surgery, bariatric surgery, gastrointestinal surgery, and oncologic surgery.