A veterinarian, a philosopher, and a dropout

Dr. Albert Bourla, the CEO of Pfizer, is not an MD. He is a Doctor of Veterinary Medicine. He received his DVM from Aristotle University in Thessaloniki, Greece (currently ranked #530).
https://www.pfizer.com/people/leadership/executives/dr-albert_bourla
https://www.topuniversities.com/world-university-rankings?countries=gr

Dr Tedros Adhanom Ghebreyesus, the Direct General for the World Health Organization, is not an MD. He has a Ph.D. in Community Health from the University of Nottingham in Nottingham, England (currently ranked #114).
https://www.who.int/director-general/biography
https://www.topuniversities.com/world-university-rankings/2023?page=1&countries=gb

Bill Gates is not an MD either. After graduating from high school in 1973, he was accepted into Harvard University in Cambridge, Massachusetts (currently ranked #4). He dropped out after two years in order to start Microsoft with Paul Allen.
https://www.gatesnotes.com/Bio
https://www.topuniversities.com/world-university-rankings?countries=us