Short answers, pulled from the story.
The New York Herald Tribune published its final edition on the 15th of August 1966, after owner John Hay Whitney announced the closure from the ninth-floor auditorium of the Tribune building. The paper was brought down by a combination of mounting financial losses, two prolonged labor strikes, and a failed joint operating agreement with the New York Journal-American and the New York World-Telegram and Sun.
The New York Herald Tribune was formed on the 19th of March 1924, when the Reid family of the New-York Tribune purchased the New York Herald from Frank Munsey for $5 million. The deal also included the Paris Herald. The paper carried a combined name until the 31st of May 1926, when the familiar New York Herald Tribune title was adopted.
The New York Herald Tribune's staff included Dorothy Thompson, Red Smith, Roger Kahn, Homer Bigart, Walter Kerr, Walter Lippmann, Tom Wolfe, John Steinbeck, Jimmy Breslin, Judith Crist, Dick Schaap, and Marguerite Higgins, among others. Homer Bigart and Marguerite Higgins both won Pulitzer Prizes for their war correspondence.
Under editor James Bellows and national editor Dick Wald in the 1960s, the Herald Tribune encouraged reporters to write in whatever style suited them. Tom Wolfe wrote lengthy features about city life for the paper and its Sunday magazine New York, edited by Clay Felker, which became a central venue for the New Journalism movement before Felker revived it as an independent magazine in 1968.
The Paris edition did not close when the main paper folded in August 1966. The Washington Post had already acquired a 45 percent stake in the European edition that same month. By the 22nd of May 1967, the edition was relaunched as the International Herald Tribune, jointly owned by Whitney Communications, The Washington Post, and The New York Times. It published until 2013, when the Times renamed it the International New York Times.
John Hay Whitney spent $39.5 million in total, including his initial investment in the Tribune and subsequent investment in the successor World Journal Tribune. Whitney purchased the Tribune in 1958 after providing two loans totaling $2.5 million, which gave him controlling interest when the Reid family's projected losses reached $3 million in that year.