Irving Oil’s former president and chairman Arthur Irving passed away on Monday, according to a company announcement. He was 93 years old.

Irving joined Irving Oil — which his father, K.C. Irving, founded in 1924 — in 1951. He became president in 1972 and was chairman emeritus at the time of his passing. Irving “remained active in the business” until his death, according to the announcement.

“For many decades at the helm of Irving Oil, Arthur worked tirelessly on behalf of his employees, customers and partners, stewarding Irving Oil from a regional oil company founded by his father in 1924, to the multinational energy company and top employer in the country that it is today,” New Brunswick, Canada-based Irving Oil said in its announcement.

Irving not only grew its Saint John refinery — the largest in Canada — but also spearheaded the company’s international expansion, eventually reaching the U.S. and Ireland.

As of this month, Forbes Magazine listed Irving as one of the 500 richest people on Earth with a net worth of $6.4 billion.

Irving’s passing comes during a time of change for Irving Oil. Last summer, the company announced it was undergoing a strategic review to evaluate a number of paths forward, including either a full or partial sale or a change in its portfolio or management structure. The review is still underway.

In February of this year, the company’s longtime president Ian Whitcomb announced he’ll be leaving Irving Oil on June 9 for personal reasons. Jeff Matthews, chief financial officer of Irving Oil, will lead the strategic review after Whitcomb’s departure.

Irving Oil has more than 1,000 branded fueling stations across New England, Eastern Canada and Ireland. It operates the largest refinery in Canada in Saint John, New Brunswick, as well as Ireland’s only refinery.