Answer by taking a quote from the following article:

Paul Frederic Bowles (; December 30, 1910 - November 18, 1999) was an American expatriate composer, author, and translator. He became associated with Tangier, where he settled in 1947 and lived for 52 years to the end of his life. Following a cultured middle-class upbringing in New York City, during which he displayed a talent for music and writing, Bowles pursued his education at the University of Virginia before making several trips to Paris in the 1930s. He studied music with Aaron Copland, and in New York wrote music for theatrical productions, as well as other compositions.

Paul Bowles is considered one of the artists to have shaped 20th-century literature and music. In his "Introduction" to Bowles' Collected Stories (1979,) Gore Vidal ranked the short stories as "among the best ever written by an American", writing: "the floor to this ramshackle civilization that we have built cannot bear much longer our weight. It was Bowles's genius to suggest the horrors which lie beneath that floor, as fragile, in its way, as the sky that shelters us from a devouring vastness".  Critics have described his music, in contrast, "as full of light as the fiction [is] of dark...almost as if the composer were a totally different person from the writer." During the early 1930s, Bowles studied composition (intermittently) with Aaron Copland; his music from this period "is reminiscent of Satie and Poulenc." Returning to New York in the mid-30s, Bowles became one of the preeminent composers of American theater music, producing works for William Saroyan, Tennessee Williams, and others, "show[ing] exceptional skill and imagination in capturing the mood, emotion, and ambience of each play to which he was assigned." Bowles said that such incidental music allowed him to present "climaxless music, hypnotic music in one of the exact senses of the word, in that it makes its effect without the spectator being made aware of it." At the same time he continued to write concert music, assimilating some of the melodic, rhythmic, and other stylistic elements of African, Mexican, and Central American music.  In 1991 Paul Bowles was awarded the annual Rea Award for the Short Story. The jury gave the following citation: "Paul Bowles is a storyteller of the utmost purity and integrity. He writes of a world before God became man; a world in which men and women in extremis are seen as components in a larger, more elemental drama. His prose is crystalline and his voice unique. Among living American masters of the short story, Paul Bowles is sui generis."  The Library of America published Bowles' works in 2002. (It prepares scholarly editions of American literary classics and keeps them permanently in print.)

How is his legacy assessed?
His prose is crystalline and his voice unique. Among living American masters of the short story, Paul Bowles is sui generis.