Nick Pyne, who has joined Arran as a non-executive director, brings 25 years of technical brewing experience to the board.
His recruitment comes as Arran puts the finishing touches to its crowdfunding prospectus, under which it hopes to raise £4 million by selling shares in £200 chunks to investors in return for privileges such as discounts and potential dividends.
The funds will go towards the proposed construction of a new brewery, bottling line and visitor centre at the former Rosebank Distillery in Falkirk, as well as expanding production on Arran.
Arran Brewery boss Gerald Michaluk said: "I am delighted that Nick could join us on the board. He has been at the leading edge of technology in the brewing industry for most of his career and has all the skills required to help advise on the scaling of Arran Brewery and building our new facilities.
"There will be a few more additions to our board as we near the launch of our crowdfunding initiative in November."
Mr Pyne began his brewing career as a graduate trainee in the production division of Scottish & Newcastle in 1983, before an 11-year spell at the Whitbread Beer Company where, as part of the research and development (R&D) team, he helped develop the first widget cans for ales.
At Whitbread, whose brewing operations were acquired by Interbrew of Belgium in 2000, he played a key role in the development of nitrokeg production, and also helped turn ale brand Boddingtons from a regional into a national brand.
Mr Pyne has also worked for Sudmo, the German equipment supplier, and then Interbrew, where he was project engineer for a brewer looking to expand into central and eastern Europe, and led its zone brewery support function for western and eastern Europe by the time it had morphed through two major consolidation deals into AB InBev.