Landon Y. Jones, who was the top editor of People magazine in the 1990s, when its profits increased fourfold, and whose fascination with popular culture inspired him to write a 1980 book that helped popularize the term “baby boomer,” died on Aug. 17 in Plainsboro, N.J. He was 80.

His son, Landon Jones III, said the cause of his death, in a hospital near Princeton, N.J., where he had lived for more than 50 years, was complications of myelofibrosis.

An unapologetic champion of the newsworthiness of celebrities, Mr. Jones was perpetually eager to learn about the next famous person. As a writer for People, he interviewed a young Bill Gates in 1983 and brought along a colleague, one of the few he knew with a personal computer, to help him understand the Windows operating system.

During his stint as People’s managing editor, the top editorial job, from 1989 to 1997, Diana, Princess of Wales, appeared on the cover dozens of times. Mr. Jones would say that People, a publication of Time Inc., was about the “three D’s”: Diana, diet and death, specifically that of celebrities.

“There were other people at People who dreamed of being on the big book — on Time,” Jeff Jarvis, a colleague of Mr. Jones’s, said in an interview. “But I never sensed that Lanny was chagrined about being on People. It was the pathway that led to the things that fascinated him, like baby boomers and celebrity. He did it with pride.”

During Mr. Jones’s tenure, People introduced color printing; moved its newsstand date from Monday to Friday to capture weekend supermarket sales traffic; and made women its primary target audience.