Prayoon Yuthasastrkosol

Luang Yuthasastr Kosol (, personal name Prayoon Yuthasastrkosol, 19 October 1893 – 11 December 1975) was a Commander of the Royal Thai Navy.
Background early career.
Prayoon joined the Royal Thai Naval Academy on 18 April 1919, and continued his studies at Thai Naval War College in 1932, where his fraternity brothers dubbed him "The professor", a nickname he kept throughout his navy career. Prayoon served in the Royal Thai Navy from 1932 to his retirement in 1957 in many positions: 
Among several official visits, Luang Yuthasastr Kosol represented Thailand in Spain, Italy, Japan, Switzerland, France, Belgium, Norway, Sweden, Denmark, USA, Taiwan and Hong Kong. In 1953, Luang Yuthasastr Kosol led the Naval Parade for the Queen’s Coronation held in the United Kingdom.
Later career.
During his last years of service, Prayoon undertook several agricultural projects such as the creation of a secured and self-managed market by parboiled rice farmers, including increased marketing opportunities and refrigeration as well as rural reconstruction of liquid gas propane, and rubber industry. An oil refinery in cooperation with American Petroleum Export Company through the flotation of a bond issue to fund the project and the initiation of the deep-sea port in Si Racha District.