Amarjeet Singh Marwa was born in Nairobi, Kenya and educated at Menengai High School, Nakuru. He played for the School team and Nakuru Rangers Hockey Club.
He also played for Sikh Union Nairobi.
He earned his first international cap in 1966 when he was selected to play against Pakistan in Nairobi.
He was selected for Mexico 1968 and Munich 1972 Olympic Games and also the Barcelona 1971 and Amsterdam 1973 World Cups.
He was selected for the Montreal 1976 Olympic team. The team was in the Olympic Village in Montreal when Kenya, together with other African countries, pulled out of the Games for political reasons at the last minute. His younger brother, Satpal was also in Kenya's team.
The Marwa family created a unique achievement by producing four brothers who represented their country by playing for the Kenyan National Hockey Team. Kenya's team in their match against Pakistan in Nairobi on 20 November 1966 included Amarjeet and his elder brothers Harvinder and Tajinder.
He resides in the UK.