Savak Dinshaw Kotwal was born on 16 November 1904 in Bombay into a staunch Zoroastrian family. His father was Dinshaji; his mother Bachamai died in childbirth when he was four, and the new baby, his brother Soli, was raised by an aunt. From boyhood he looked to God for love, and as a young man he sought out saints, receiving the darshan of Upasni Maharaj, Narayan Maharaj and Hazrat Babajan.
In May 1928 he came to Meherabad wishing to join the ashram. In a private meeting on 1 June he told Meher Baba, "I desire God-realization in this birth." Baba answered, "Either long for God or for the world; you cannot have both!" Savak was married to Nergiz and had a baby daughter, Najoo, so Baba told him to visit every weekend. Baba also told him to stop visiting other holy men, but sent him to the great Bombay saint Tipu Baba with the message "The Emperor has sent me." In 1929 Nergiz, feeling neglected, came to confront Baba, who reassured her: "I have come to unite, not to divide. Even if you leave Savak, he will never leave you."
Several years passed before Savak was ready to surrender completely. In 1936 he helped bring masts and mad persons to Baba's ashram at Rahuri. Early in 1940 he quit his job in Bombay and announced that he would go off to the Himalayas. Baba called him to Bangalore and said, "If you find a better guru than me in the Himalayas, you may go; otherwise, come and stay with me." On 15 March 1940 Savak, Nergiz and their three children, Najoo, Hilla and Adi, joined Baba's ashram permanently, having sold all their possessions. Savak handed Baba the family's entire finances and Nergiz's jewelry, and Baba promised, "From today until the very end, I shall see to every one of your family's smallest needs, and to you I shall give the Ocean!"
Savak worked in the mast ashram at Meherabad, spent a period of enforced silence with Gustadji, Pleader and Swami Bhabananda in the caves at Ankai, and travelled with Baba on many mast tours, at times sent ahead to locate masts and make arrangements. His family lived for years in the Family Quarters near Arangaon. For many years he served as one of Baba's night watchmen. At the 1955 sahavas Baba said of him, "Since 1940, he and his family have dedicated themselves to me. Savak obeys me literally."
Failing health led Baba in June 1958 to allow him to stay with his family in Bombay. Savak died there on 7 June 1989, eighteen days after Mehera. In 1955 Baba had placed him on a list of men mandali to be buried at Meherabad "circumstances permitting", but Savak had never told his family of it, and Zoroastrian last rites were held at the Tower of Silence. His daughter Najoo told the family's story in the book He Gives the Ocean (2006).