Sister Mary Joan Boyd, P.B.V.M., who served at the Presentation Retreat Center at Mount St. Joseph in New Windsor for 23 years, died Sept. 18 at Mount St. Joseph. She was 82. She served at the Retreat Center until her retirement in 1996. She was the coordinator of care for the younger children at the Mount St. Joseph Semi-Military School from 1945 to 1973. After her retirement, she was the congregational sacristan. Born in the Bronx, she entered the Sisters of the Presentation of the Blessed Virgin Mary in 1942 and professed final vows in 1948. A Funeral Mass was offered on Sept. 21 at the Mount St. Joseph Chapel in New Windsor with burial at Mount St. Joseph Cemetery.