Louis is a founding partner of Milne O'Dwyer, which was established in 1973. . He services a multi variety of clients drawn from the small/medium Enterprise, Corporate, Professional and Agri Sectors. He works closely with clients in providing a comprehensive menu of business and taxation solutions.

He is a qualified member of the Institute of Certified Public Accountants and the Irish Taxation Institute. He has a keen interest in community affairs and has served on a number of committees and boards on various local development issues.