David Bernard Cornstein (born August 17, 1938) is an American businessman and diplomat who was the United States Ambassador to Hungary between 2018 and 2020.

As the only child of Irwin, who worked in the rug business, and Fanny, a schoolteacher, Cornstein grew up in the city.

in 1960 from Lafayette College in Easton, Pennsylvania, where he is still a donor and part of the university's Marquis Society today.

Cornstein later dropped out of the race after Republicans leaders backed the eventual candidate, John Faso.

In September 1999, he was named chairman of TeleHubLink, a telemarketing company that produced wireless encryption products.

Instead, Telehublink sent them a 'discount benefits package' consisting of generally worthless items such as an application for a credit card.

[9] In January 2003, the Third Department of the New York State Supreme Court, Appellate Division, upheld a 2001 ruling that "had halted the scam and awarded restitution to victimized consumers.

[2][18][16] Cornstein stated that Soros had a crazed hatred of Orbán, which led CEU not to make concessions to stay in Hungary.

[16] Cornstein mocked the size of Central European University, said that the departure of CEU "doesn't have anything to do with academic freedom", and mused why "this has become such an important subject in the world".

[2][18] Asked by The Atlantic's Franklin Foer if US relations with Hungary would suffer as a result of the CEU ouster, Cornstein answered "not really.

Ambassador to Hungary, highlighting his close support of Orbán's policies and unchecked power, as well as extravagant spending on parties.

[19] On September 15, 2020, the U.S. Embassy in Budapest announced that Cornstein informed President Trump and Hungarian Foreign Minister Péter Szijjártó that he would end his service as U.S.