Dr Lok graduated from Hong Kong and obtained his PhD in fetal medicine in Adelaide. He had his specialist then subspecialist training in reproductive medicine in Sydney, Adelaide and UK. Derek is currently a consultant gynaecologist at Liverpool, RPA and Westmead Hospitals, and a senior clinical lecturer at UNSW, involving in undergraduate teaching, specialist and subspecialist training. Derek is aslso a fertility specialist at Genea, Westmead Fertility Centre and RPA Fertility, with major interests in male factor infertility, advanced reproductive endoscopic surgeries such as severe endometriosis, myomectomies and microsurgeries (laparoscopic tubal reanatomosis and surgeries, vasectomy reversal, microTESE), and IVF failures including miscarriages.