David McCallum is a Scottish actor and musician, best known for his role as Dr. Donald "Ducky" Mallard on the popular television series NCIS. Born on September 19, 1933, in Glasgow, Scotland, he began his career in the 1950s and gained fame for his performances in both film and television. In addition to acting, McCallum is also a talented musician, having released several albums featuring his skills on the musical instrument violin. Over the years, he has appeared in various films and TV shows, showcasing his versatility and dedication to the performing arts.