He was a 20th-century Belgian-born missionary and priest with the Congregation of the Sacred Hearts of Jesus and Mary.
[2] He served for most of his life in Hawaii[3] most notably during the 1950s at the leper colony at Kalaupapa on Molokai.
His service there followed in the tradition of fellow Belgian priest, Saint Damien, and his contributions were part of the research gathered by Gavan Daws for the definitive biography Holy Man: Father Damien of Molokai.
[4] On August 9, 1958, he was elected as the seventh Superior General of the order.
[6] On April 17, 1967, Systermans was part of a delegation meeting Pope Paul VI to present petitions advocating beatification of Father Damien.