John Joseph Scocca, a retired Johns Hopkins biochemistry professor recalled for his keen critical eye, died of chronic obstructive pulmonary disease May 10 at Gilchrist Hospice Care in Towson. He was 72 and lived in Aberdeen.

Born in South Philadelphia, he came to Baltimore in 1958 as a Johns Hopkins University undergraduate and went on to spend his entire career at the school. He earned a bachelor's degree in three years and received a doctorate in biochemistry. He then became a professor at what is now the Bloomberg School of Hygiene and Public Health, where he retired four years ago.

Family members said that in his third year of graduate school, he taught laboratory technique to a group of students that included his future wife, Jane Ruble.

They moved to a home on Monterey Road in Ednor Gardens north of the old Memorial Stadium. He, his wife and children were Orioles fans and enjoyed attending games. In 1977, the family moved to Aberdeen.

Colleagues said that as a professor at the School of Public Health, he taught biochemistry to graduate students from outside the biochemistry department. He called his course "baby biochemistry," but friends said he was a thorough and demanding scientist-teacher. He also valued concise speaking and brevity.

"Perhaps John's most significant contributions involved his 30-year tenure as chief organizer of the laboratory rotations for first-year doctoral students," said a Hopkins colleague, Roger McMacken, who lives near Lake Roland. "John operated a dreaded alarm clock that so loudly, rudely and famously halted student rotation talks precisely 10 minutes after the start of any still-continuing research presentation."

Mr. McMacken said this was an "immensely effective training strategy." By the time the students returned for more oral presentations, they "were virtually all completed before the sound of the jarring alarm clock."

He recalled his favorite "Scocca moment," which involved the annual opening day meeting of the department faculty with an incoming class of doctoral students.

"John, because of his wit, keen sense of humor, candor, and unparalleled scientific integrity, routinely had the honor of describing the department's academic program for first-year students," said Mr. McMacken. "What followed was an impassioned exhortation about the do's and don'ts of laboratory research and academic life. No one, including John, knew precisely what he was going to say. But you could certainly count on 45 minutes of a hilarious, off-the-cuff soliloquy that perpetually was a highlight of academic life for us."

Family members said that his personal research work involved the study of the bacterium Haemophilus influenzae and its interactions.

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John Joseph Scocca, Hopkins biochemistry professor