While looking for more information on the book Provincial Administration and Local Government in Thailand, written in 1968 by William A. Sommers, instead of a table of contents or a recension Google instead found me an essay written by Mr. Sommers in the electronic journal American Diplomacy last month. As a municipal administrator Mr. Sommers worked as an adviser in several countries, including 1963 to 1969 in Thailand.
In the essay titled Remembering Saisith he recalls the meetings with Saisith Pornkaew (สายสิทธิ พรแก้ว). In 1966 on a field trip with the Director General of the Department of Locak Administration to Ubon Ratchathani, Mr. Sommers suggested his student Saisith as being the best candidate to become new district officer of Loeng Nok Tha. The incumbent was seriously wounded in an attack by insurgents and a replacement was needed.
For Saisith this was the beginning of a career in provincial administration, he later was province governor in Ubon Ratchathani, Sakon Nakhon, Chainat, Nan and Samut Prakan - at least those are the positions I could find in the governor lists I have. If I interpret this entry in the library catalog of the Sukhothai Thammathirat Open University, it is the memorial book published on his cremation in 2006.