Michael S. Rosenwald

He made it his mission to track down every book Mark Twain owned — and to fix what he saw as flaws that kept schools from teaching the author’s most famous works.

Alan Gribben, a Mark Twain scholar who replaced a racial slur with the word “slave” in revised editions of “The Adventures of Tom Sawyer” and “Adventures

An accomplished jazz guitarist, he appeared on more than 300 episodes of the public television show, playing alongside musicians like Wynton Marsalis and Yo-Yo Ma.

By Joe Negri, an elegant jazz guitarist who passed up touring with Tony Bennett and other luminaries to remain in Pittsburgh, his beloved

Joe Negri, an elegant jazz guitarist who passed up touring with Tony Bennett and other luminaries to remain in Pittsburgh, his beloved hometown, where

The author of books like “The Possible Human,” she held workshops that drew on mythology, psychology and the experiential ethos of Esalen. But she refused to be called a guru.

Jean Houston, a spellbinding figure in the human potential movement of the 1960s who used guided imagery to inspire unmoored suburbanites, burned-out

A photo provided by the Moriarty family shows artist Jerry Moriarty with some of his paintings in his loft in Manhattan in 2010. MORIARTY FAMILY/NYT

A research scientist at Lockheed, he came up with the idea for a computer system that would search scientific and technical literature almost instantaneously.

By In 1966, to pass the time on a long family road trip, Roger Summit pulled out a tape recorder and began dictating some thoughts about an idea he had been kicking around at work.