Generations of St. John’s University students benefited from pharmacology professor Michael Barletta’s deep well of knowledge, but they weren’t the only ones.

A longtime Garden City resident, Barletta was also a reliable source of valuable information for his family and friends.

“If you had a question or were worried about taking a certain medication,” said Barletta’s grandson, Michael Malaszczyk, “you could call him and he would explain how it would affect you from head to toe.”

Barletta, whose passion for pharmacology began on the streets of his native Brooklyn as a drugstore delivery boy, died Oct. 24 after a stroke, his family said. He was 84.

A funeral Mass for Barletta is set for 11 a.m. on Monday at Church of St. Joseph, 130 Fifth Street in Garden City, according to an announcement on the St. John’s University website.

Barletta, who was born in Brooklyn on July 15, 1942,  attended St. John’s and later earned a Ph.D in cardiovascular pharmacology. In later years, he began researching holistic medicines for diabetes, said his wife, Helen, who met her future husband at St. John’s.

“Teaching was everything to him,” Helen Barletta said. “He could take the most complex concept and break it down for someone without being condescending.”

The couple’s first daughter, Lisa Marie, of Garden City, was born in 1967 in New Mexico, where Michael Barletta served at the time with the U.S. Public Health Service Commission Corps. He eventually reached the rank of lieutenant with the uniformed service branch.

The Barlettas later returned to New York, where their second daughter, Alice Jeanne, of Kissimmee, Florida, was born in 1972. That’s also when Michael  Barletta began his five decades on the faculty of St. John’s college of pharmacy and health sciences.

He led a busy life, Barletta’s family said. Along with teaching, Barletta worked part-time over the years as a pharmacist in Garden City and at Winthrop Hospital in Mineola, now NYU Langone Hospital. But his priorities were always in order.

“He never missed anything, whether it be a birthday, a concert or a graduation,” Michael  Malaszcz yk said.

Along with his wife, daughters and grandson, Michael Barletta is survived by several grandchildren and great grandchildren.