Pasqual Mario Marafioti was a physician and laryngologist for the Metropolitan Opera.
He gave up his medical practice in 1930 and became a vocal coach for Metro pictures.
Marafioti became famous for studying Enrico Caruso's voice while coaching him.
He subsequently published the book Caruso's Method of Voice Production: The Scientific Culture of the Voice in 1922, shortly after Caruso's death.
[1] The book focuses on physiological methods of voice production.