- Was notorious on the Firefly (2002) set for calling his character's sister her real name (Summer) instead of her character's name (River).
- Maher told an interviewer from afterelton.com that he took two years off from his career after the birth of his daughter to be a stay-at-home dad.
- Sean and his husband, Paul, have two adopted children - Sophia Rose (b. 2007) and Liam Xavier (b. 2010).
- Joss Whedon offered him the role of Don John in Much Ado About Nothing (2012) after learning he had never played a villain before.
- His partner between 2001 and 2004 was Sheryl Sutherland.
- Graduated from Byram Hills High School in Armonk, New York, which he attended at the same time as actors Eddie Cahill and Eyal Podell.
- Irish-American.
- Graduated with a drama degree from New York University (NYU). (1997)
- Attended the Playwrights Horizons Theatre School, a studio in New York University's Tisch School of the Arts.
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