Dr Marc Krikor Kaloustian obtained his DDS degree from Saint Joseph University of Beirut in 1999. He then completed a Certificate in Advanced Education in General Dentistry at Boston University, Goldman School of Dental Medicine, in 2000. He went on to obtain a Master's degree in Endodontics and a Master's degree in Biomaterials, and was awarded his PhD with honours from Saint Joseph University, Lebanon, in 2020.

He is currently a faculty member in the Department of Endodontology at Saint Joseph University Dental School, Lebanon, where he supervises undergraduate and postgraduate students. He also lectures on the Master's programme in Endodontics at the University of Siena, Italy.

Dr Kaloustian is the President of the Lebanese Society of Endodontology and co-organiser of numerous international endodontic meetings. He is a Diamond member of Style Italiano Endodontics, an international lecturer and the author of many publications in indexed journals.

Dr Kaloustian maintains a private practice in Beirut limited to endodontics and works as an endodontist in the United Arab Emirates at the American Dental Center in Abu Dhabi and Oris Dental Clinic in Al Ain.