Attended Skowhegan School, ME, and received an MFA from Columbia University, NY, where he was sculpture assistant to Peter Agostini. One person exhibitions include the Lori Bookstein Gallery, NY; M-13 Gallery, NY; Leslie Cecil Gallery, NY; Gaumann Cicchino Gallery, FL; University of Kentucky; ISA Gallery, Umbria, Italy; and Haverford College, PA. Group exhibitions include Salander-O'Reilly Gallery, NY; Rising Tide Gallery, Provincetown, MA; Schlesinger Gallery, NY; and Maurice Arlos Gallery, NY. Awards include New Jersey State Council Fellowship Grant; Brevoort Eikenmeyer Fellowship; Columbia University School of Engineering Purchase Prize; Ingram Merrill Grant; and Skowhegan Painting Prize. Teaching experience includes Yale University, CT; New York University; University of North Carolina; City University of New York; Haverford College; Parsons School of Design, NY; Chautauqua School of Art, NY; and Sarah Lawrence College, NY. Gagnier has also held two residencies at the International School of Art, Umbria, Italy.