Casey O’Brien is an American forward and one of the defining offensive leaders of the New York Sirens in the Professional Women’s Hockey League (PWHL). A native of Massachusetts, O’Brien developed through elite U.S. programs before starring at the University of Wisconsin, one of the most dominant programs in NCAA women’s hockey. With the Badgers, she was known for her elite vision, playmaking ability, and hockey sense, helping Wisconsin capture multiple NCAA National Championships while establishing herself as one of the top forwards in college hockey.

During her collegiate career, O’Brien earned numerous individual honors, including All-American and conference awards, and consistently ranked among national scoring leaders. Her ability to control the pace of play, create offense in tight spaces, and elevate her linemates made her a cornerstone player at Wisconsin. These traits translated seamlessly to the professional level, where she joined the New York Sirens and quickly became a central figure in the team’s identity, serving as a leader both on and off the ice.

Internationally, O’Brien has represented the United States at multiple levels, including the senior national team. She has earned gold medals at the IIHF Women’s World Championship, contributing as a dependable two-way forward in high-pressure international competition. Her career with the New York Sirens reflects elite hockey intelligence, championship pedigree, and a lasting impact on the growth of professional women’s hockey.