Reginald Callister was born on 1889. he was the brother of Cyril Callister (1893-1949) who invented the yeast spread Vegemite. Reginald died in 1971.
After serving during World War One he was appointed by the Commonwealth Institute of Science and Industry in Melbourne, to investigate Ballarat's white earthenware. Soon after, on 27 June 1919, it was announced that Callister would be attached to the Ballarat School of Mines to carry out his duties, and to examine the possibility of establishing a pottery industry using local clays, especially the Lal Lal locality which was thought to be rich in clay deposits. 
The 1922 SMB Anual Report boasted: Considerable success had also rewarded the efforts of Mr. R.C. Callister in his investigations into the suitability of clays in the Ballarat district for the manufacture of white earthenware products. His porcelain productions compared favourably, it was said, with other specimens of high grade porcelain ware of that time. In conjunction with Mr Callister's investigations into clays, additional samples of decorative earthenware were manufactured on various occasions in the Technical Art School's Pottery Class and these samples had been "fired" with satisfactory results. At this time an electrical process for "baking" pottery was being tried at the Technical Art School and it was yeilding good results which suggested the possibility of producing, at relatively low costs for clays in the Ballarat district, large quantites of porcelain ware for marketing. 
The Ballarat Courier on February 1927 reported: 'Mr Reg Callister, who was engaged at the Ballarat School of Mines in making investigations on the subject of pottery clays, has now started work at the pottery school at Stoke on Trent, England under Dr Mellor. Mr Callister went to England on behalf of the Bureau of Science and Industry. Dr Mellor is a famous scientist, and an expert employed for research work by the British pottery manufacturers.'
Enlistment papers - http://recordsearch.naa.gov.au/scripts/Imagine.asp?B=3190571
Callister, Jamie, The Man Who Invented Vegemite, Pier9, NSW, 2012.
Paton, Kay, Yendon's World War 1 Memorial Book, Yendon History Group, 2014
- ↑ https://www.ballarat.edu.au/curator/honour-roll/honourroll_Callister,%20Reg.shtml
- ↑ Ballarat School of Mines Annual Report, 1922