Roseman was invited to share in the day-to-day life in monasteries of the Benedictine, Cistercian, Trappist, and Carthusian Orders, the four monastic orders of the Western Church. The artist painted portraits and made drawings of monks and nuns at prayer, work, and study. He drew them at the communal worship in church and in meditation in the quietude of their cells. Roseman's ecumenical and critically acclaimed work, brought to realization in the enlightenment of Vatican II, depicts monks and nuns of the Roman Catholic, Anglican, and Lutheran faiths. Roseman created his work in over sixty monasteries throughout England, Ireland, and Continental Europe.