Jillian Quackenbush and Thomas O'Brien were married on Sept. 13 at St. Agnes Cathedral in Rockville Centre. The reception was at the Woodbury Country Club in Woodbury. She is the daughter of LuAnn and Alan Quackenbush of Sayville. The bridegroom is the son of Teri and Tom O'Brien of upstate Latham. Both the bride and groom work as physician assistants for Winthrop-University Hospital in Mineola and each earned a bachelor's degree from SUNY Cortland and a master's degree from the New York Institute of Technology. They live in Long Beach.