Koehler & Isaak was an architectural firm active in Manchester, New Hampshire, from 1946 to 1970 and under other names until 1985.
Meanwhile, Isaak worked for Huddleston in Durham and for Lockwood Greene Engineers in Boston.
[6] Major works completed by Koehler & Isaak include federal office buildings in Concord, Keene, Manchester and Portsmouth, several state office buildings in Concord and much of the campus of Saint Anselm College.
In 2012 the sale of this building spurred the department to contract with preservation consultant Lisa Mausolf to prepare a report on mid-century modern architecture in the state.
Among her recommendations was the writing of a monagraph on the work of Koehler & Isaak as the most prominent local architectural firm of the study period.