W. A. F. J. Tumbelaka

Willem "Wim" Alexander Frederick Joseph Tumbelaka (24 April 192011 September 2012) was an Indonesian physician and academician. He worked in the Faculty of Medicine of the University of Indonesia (UI) and became the acting dean of the faculty for several months in 1976. He also became the acting rector of the university from 1985 until 1986.

Early life and education Tumbelaka was born on 24 April 1920 in Kotamobagu, Sulawesi, as the second child of ten children. His father, Isaac J. Tumbelaka, worked as an attorney, while his mother, Margaretha Siwydan, was an obstetrician. Upon completing his primary studies at the Hollandsch-Inlandsche School in Kotamobagu in 1933, Tumbelaka moved to Tomohon and completed his secondary education at the Meer Uitgebreid Lager Onderwijs in 1936. Tumbelaka was unable to continue his studies for two years due to a lack of funding from his parents. He was able to continue to study after one of his uncles sent him to study in Surabaya. On his final year in Surabaya, the Japanese invaded Surabaya, and the school he was studying on was closed. With the help of politician Sam Ratulangi, Tumbelaka was sent to Japan to study medicine. and at the University of Colombo in 1975. As a pediatrician, Tumbelaka held leading positions in pediatric organizations such as the Indonesian Pediatrician Association and the ASEAN Pedriatic Federation. He actively promoted the usage of breast milk for infants and invented honey sugar milk (susu gula madu, SGM), which became a popular variant of milk in Indonesia. He was replaced as first deputy dean in 1977 and became a professor in pediatrics in 1981. He retired from UI shortly after.

Personal life Tumbelaka was married to Concordia Sophia Lodola Mononutu, the niece of former minister Arnold Mononutu. The couple has three children. On one occasion, Tumbelaka had to expel two of his children, who were studying at UI's medical faculty, for failing to pass an evaluation.