Island Federal Credit Union in Hauppauge, N.Y., said its longtime president and CEO, Robert J. Dethlefsen, is retiring effective Nov. 30.

“The name Bob Dethlefsen will forever remain synonymous with Island Federal Credit Union,” the 26,000-member New York CU said in a statement. “Every product, every service, every innovation introduced over the past 34 years has been the result of Dethlefsen's leadership.”

Dethlefsen joined Island FCU in 1977 and has been its president since 1980. During that time, it has grown from $17 million and a single location to $778 million and six branches in Bellmore, Hauppauge, Sayville, Selden and Brooklyn.

Dethlefsen also has been a nine-year member of the NAFCU board, chairman of NAFCU Services Corp., a founding director for Card Services for Credit Unions and a founder of the advisory board for core processor XP Systems, now a part of Fiserv Inc., Island FCU said.