[citation needed] In 1930, at age 15, Mentschikoff began her undergraduate education at Hunter College in New York City, where she majored in English and political science.

[2] In 1942, when Llewellyn was appointed by the American Law Institute to be the chief reporter in drafting the Uniform Commercial Code, Mentschikoff was named his assistant.

Due to the school's anti-nepotism rule, Llewellyn was named a "professor," while Mentschikoff was given the title "professorial lecturer."

In 1964, she represented the United States at a diplomatic conference in The Hague, where she pushed for a uniform law governing international sales and arbitration.

During her tenure as dean, she worked to limit enrollment, improve the law library, and hire quality faculty.