He was educated in the U. S. and trained in architecture at Cornell University.
Starting as a draftsman in New York, Mr. Rossiter was successively employed in a number of offices, and early in the 1900’s opened an office for independent practice.
During several years he practiced under the firm name of Rossiter & Muller, identified with the design of various public buildings in New York state and New England, among which may be cited Hepburn Hall, University of Vermont at Middlebury, 1916; Church of St. Michael, Litchfield, Conn., 1919; St. John's Church, Washington, Conn., 1917; Public Library, Colton, IN. Y. and Libraries in several other towns, also schools in Scarsdale, and elsewhere in the state.
From 1912 until his death he was a member of the New York Chapter, A.I.A. and the architectural Leaque of New York.