Darshan Singh Kullar was born in Sansarpur, Punjab and studied at Cantonment High School and MGN High School in Jalandhar.
He played hockey and took part in Athletics whilst at School. He played at the School National championships in 1955 and 1956.
He played for an invitation Club team, Sikh Union in Jullundhar (a Club run by Businessman Ujjar Singh) and it was during the Punjab Nationals held in Jullundhar in 1956 when his talent was spotted. It was during a match against Punjab Police at the Punjab Armed Police stadium. Playing for Punjab Police was Ashwini Kumar (who later became Director General of Border Security Forces and President of Indian Hockey Federation) who noticed his talents and invited him to join the Police Service.
He joined Punjab Police in October 1957 and never looked back from there.
He played for Punjab Police and Punjab from 1958 to 1966.
He was a member the Gold Medal winning Punjab Team in National Hockey Championship in Bhopal 1962 and Bombay 1965; Bronze Medal in Hyderabad 1961, Madras 1963 and Delhi 1964.
He was a member of the Gold Medal winning Punjab Police Hockey Team in All India Police Games in Calcutta 1959, Hyderabad 1961, Trivandrum 1962, Jaipur 1964 and Guwahati 1966. He was in the Bronze Medal Team in Delhi in 1960.
He earned his first international cap on tour of East Africa in 1959. He toured East Africa again in 1963.
He played at the 1962 Ahmadabad international tournament; 1962 Asian Games in Jakarta where India won the Silver medal and the Lyons international tournament in 1963.
He toured New Zealand in September 1964 on route to Tokyo 1964 Olympic Games.
He was a member of India's Gold Medal winning team at Tokyo 1964 Olympic Games.
He retired from international hockey after the Hamburg International tournament in 1966 and immigrated to the UK in June 1966.
He played and coached the Indian Workers Association Hockey team in Coventry.
He played for Shifnal, Shropshire, Bournville, United Brothers Hockey Club and Khalsa Hockey Club in the UK.
He resides in the UK.