Forsberg was a teacher at Pace College and New York University from 1931 to 1937, and publisher with Street and Smith Publications in New York City from 1937 to 1942. In 1942 he joined the United States Army, where he rose to the rank of colonel. He helped start the publications Yank and Stars and Stripes.[2] From 1946 to 1948 he was publisher and consultant with Forsberg and Church in New York City. He was publisher of Liberty Magazine in New York City (1948–50) and publisher and consultant with Forsberg, Merritt, Harrity and Church in New York City (1950–55). Forsberg was publisher of Popular Mechanics Publishing Co. in Chicago, Illinois from 1955 to 1959. From 1959 to 1972 he was a publisher with Holt, Rinehart and Winston in New York City. After a career as publisher, Forsberg was appointed U.S. ambassador to Sweden in 1981, a position he served in until 1985.