After World War II, Harvard graduates were highly sought after, and like many of his colleagues, was offered a job right on the spot.
He then became a researcher for the National Housing Agency in Washington, D.C., and later joined the architect firm Skidmore, Owings and Merrill in New York.
In 1948, Johansen settled down and established his practice in New Canaan, Connecticut, to accompany four of his other colleagues, Marcel Breuer, Philip Johnson, Landis Gores, and Eliot Noyes.
Johansen's designs stressed function over form, and focused on social, urban, and anthropological conditions, and strived to avoid creating overpowering megastructures.
The Palladian prototype is most noticeably present in Villa Ponte, or the Warner House, built in 1957 in New Canaan, Connecticut.
It had been considered for landmark status and adaptive reuse, while its owners proposed redeveloping the site with residential and retail development.
"[citation needed] Another of his best-known buildings is the Mummers Theater in Oklahoma City (1970), an aggregation of fragmented units connected by walkways and tubes.
[2][10][11][12] The theater, more recently called Stage Center, was demolished in 2014 after years of maintenance costs, and a June 2010 flood led to its closure and consideration of alternative uses or demolition.