Dr. Mahdi Mousavi, (full name: Seyed Mahdi Mousavi Hosseini Nourbakhsh Kouhestan), born on March 23, 1982, in Mashhad, is a researcher and author in the field of sports sciences with a Ph.D. in Exercise Physiology. In 2008, his book "Scientific and Specialized Principles of Bodybuilding and Fitness" was published. This two-thousand-page work is the first organized and scientifically-based book on bodybuilding in Iran. For some time, he served as the head of the Education, Research, and Planning Committee of the Bodybuilding Board at the Physical Education Institute of Astan Quds Razavi. He is widely known for his strong opposition to the use of drugs and sports supplements and has given numerous interviews advocating against the use of these substances. Mahdi Mousavi is a descendant of Ayatollah Al-Uzma Seyyed Abo-Taleb Hosseini (Tabatabaei), also known as Mojtahed Qaeni (1230-1293 AH), a prominent Shia cleric.