(November 26, 1947 – September 9, 2022) was the former Superior General of the Marist Brothers order, a role he held from October 3, 2001, until 2009.

He attended the Marist-run St. Agnes Boys High School, and continued on to the juniorate in Cold Spring-on-Hudson, New York.

In 1978 he was invited to be a staff member at the House of Affirmation, a renewal and rehabilitation center in Massachusetts, and was named its International Clinical Director in 1982, a position he held until 1987.

He was named provincial of the Poughkeepsie Province in 1987 and was elected president of the Conference of Major Superiors of Men Religious of the US.

After returning back to the United States, Brother Seán was appointed the Scholar in Residence at Marist College in Poughkeepsie, NY.