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A white woman is wrapped in Lottery scratchers, with a big smile.

Dr. John Zhang, a well-known specialist in reproductive medicine who runs the New Hope Fertility Center out of a vast and science-fiction-looking office on Columbus Circle, believes he has played a singular role in the fiscal health of New York City. Patients come to him from around the world, from the Middle East, from Kenya, from Nigeria, Spain and China. Perhaps especially from China.

Dr. Zhang is a native of Hangzhou, in Zhejiang Province, “a city that produces smart people,” he explained on a recent afternoon from behind a desk with a view of Central Park and the Time Warner Center, where he lives. Jack Ma, the business magnate and founder of the Alibaba Group, is also from Hangzhou. “People say, ‘Who are the two most famous people from Hangzhou?’ They say, ‘Dr. Zhang and Jack Ma!’” Dr. Zhang’s speaking style rarely omits enthusiastic punctuation.

Infertility treatments can take a long time and often require daily blood tests, so his patients stay in hotels — expensive ones, like the Mandarin Oriental around the block — and go to restaurants, he...