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Tucker, now 100, said he continues to work full time, with his typical day lasting from 9 a.m. until 6 p.m.
The doctor said he caught COVID-19 shortly after his 100th birthday in July, but he continued to teach his residents via Zoom while recovering.
"I regard this Guinness World Records title as a singular honor and look upon it as another achievement in a long, satisfying and happy life," Tucker told Guinness World Records.
The centenarian, whose wife, Sue, 89, is also still working as a practicing psychoanalyst, said he has no plans to retire.
"Gosh, no! I believe retirement is the enemy of longevity. Even in my younger years, I never once contemplated retirement," he said. "When you love what you do and are still capable of doing it, why would you want to retire?"