He was born in May 1957 in Ünye. He completed his primary and high school education between the years 1963-1974 in Ünye. He was graduated from Cerrahpaşa Medical Faculty, Istanbul University in 1981.
He performed his duty in army between 1982-83 and worked at a private hospital in Istanbul as a practitioner for 4 year.
He did his residency on Urology between 1987-1992 at the Department of Urology in Cerrahpaşa Medical School, Istanbul University. He continued his work on Urology since then until 2010 at the Department of Urology in Cerrahpaşa Medical School, İstanbul.
His speciality in Urology is Urooncology and Endourology; and he exerted his work on percutaneous nephrolitotomy, urologic laparoscopy, ureterorenoscopy, robot assisted laparoscopy and uro-oncologic operations both as professional performer and trainer throughout this period. He became an Associated Professor in 2000 and Professor in 2009 on Urology. Prof. Onder has more than 200 publications (papers and congress presentations), 5 chapters in medical books and more than 35 lectures in congresses.
He worked in the executive committee of the Turkish Endourology Society for a period. Prof. Onder retired in July 2011 and moved to Cyprus, the homecountry of his wife, in order to establish the Department of Urology in Near East University Hospital, the first University Hospital in the Island.
His hobbies are photography, guitar, sailing, skiing and video editing. Prof. Onder is married with Prof. Nerin Bahceciler Onder and has a 11 year old son.