Isaac STERN was a renowned violinist who was born in Russia in 1920 and moved to the United States at the age of nine. He was a child prodigy, performing his first public concert at the age of six. He went on to become one of the most celebrated violinists of the 20th century, performing with some of the world's leading orchestras and recording over 50 albums. He was also an influential teacher and mentor, and was awarded numerous awards and honors throughout his career. His last name, STERN, is the answer to the crossword puzzle clue.