After growing up and going to school in Lebanon, Prof. Chaoui attended medical school in Germany. He specialized in Prenatal Diagnosis at the Department of Obstetrics and Gynecology at Charite Hospital in conjunction with Humboldt University, Berlin. He first started using ultrasound in 1986 and became interested in Cardiovascular Hemodynamics in Fetal Echocardiography using Doppler ultrasound in 1987.

In 2001, he became a professor of Obstetrics and Gynecology at Charite Hospital in Berlin, and has been at the Private Center for Prenatal Diagnosis and Human Genetics in Berlin since 2004. He is a Member of the Board of the International Society of Obstetrics and Gynecology as well as a Member of the Board of DEGUM, where he is also Level III certified.

In addition to his other duties, he is a member of the editorial board of several national and international journals and author and co-author of more than 200 articles and monographies.