Donald "Buck Dharma" Roeser is an American musician, best known as the lead guitarist and vocalist for the rock band Blue Öyster Cult. Born on January 12, 1947, in Long Island, New York, he has been a key member of the band since its formation in 1967. Roeser is recognized for his distinctive guitar work and songwriting contributions, including the hit song "(Don't Fear) The Reaper." In addition to his work with Blue Öyster Cult, Roeser has pursued a solo career and collaborated with various artists. His musical style blends elements of rock, hard rock, and heavy metal, showcasing his versatility as a guitarist and songwriter.