Leonard Lopate and Jonathan Schwartz, two of New York’s most popular and longest tenured radio hosts, were placed on leave by New York Public Radio on Wednesday as the company investigates allegations of inappropriate conduct.

Mr. Lopate, 77, has been a host on WNYC, which is owned by New York Public Radio, for more than 30 years, discussing the arts, politics, food and other topics each weekday. Mr. Schwartz, 79, hosts the station’s The Jonathan Channel as well as other programming on weekends.

WNYC disclosed that it had placed the men on leave just days after John Hockenberry, another well-known WNYC host, was accused by several women of sexual harassment, unwanted touching and bullying in an article published by New York magazine’s The Cut. Mr. Hockenberry was a founder of “The Takeaway” and its host for nearly a decade before retiring in August.

Laura Walker, chief executive of New York Public Radio since 1996, said in a statement that the station “takes these kinds of allegations very seriously and is reviewing these matters promptly.”