He designed many churches and schools around southern New England, after being associated with the office of Walter F. Fontaine for many years.
At that time he was noted as an alum and instructor in architecture at the Rhode Island School of Design.
Mosher's design eschewed commonplace materiality, substituting textured clapboarding for stone.
Also for Fontaine's firm, Mosher had charge of the final phases of St. Cecilia's in Pawtucket, completed in 1946.
[6] Completed in 1949, it was Mosher's first International Style work, enhanced in 1962 by an addition by Ira Rakatansky.
Mosher's next project was for St. Anne's church in New Bedford, a much more academic Colonial Revival composition, complete with portico and pediment.
Here, Mosher combined several Italian and Spanish precedents for his design, for a Mediterranean feel.
[9] It was a small, simple Gothic Revival church, similar in style to the older St. Luke's, though this time executed in standard brick and concrete.
It is devoid of ornament, with the exception of a stylized panel above the main entrance on Davis Street.
[16] It may be noted for its entrance canopy, a simpler version of the one that may be seen on Veterans Memorial High School in Warwick.