John trained and qualiﬁed with Deloitte & Touche in Ireland before moving to Bermuda in 1982 to work for KPMG. In 1984 he joined the Naess Group, a private international shipping and venture capital investment company and was subsequently appointed Chief Financial Oﬃcer. In 1990, he formed Atlantic Corporate Management Limited (ACM), a ﬁnancial and business management company specializing in the international shipping and energy industries. In 1997, ACM formed Delphi Management Limited, a private equity and alternative investment administration company. In 2001, he acquired Interpetroleum Services Limited, a company involved in chartering and ﬁnancing activities in the oﬀshore industry in the Gulf of Mexico.
John is a board member of various private equity, hedge fund, private client investment vehicles and shipping companies. He is a former board member of the Association of International Companies in Bermuda and past chairman of the Bermuda International Shipping Association.