From 1942 to 1945 he served with the Armed Forces. He headed a mural project and executed murals in the United States and Belgium. His first exhibition in woodcut was held at the New School for Social Research and his second at the Smithsonian Institute in 1949, and in 1949 he travelled to Paris to study for a year. On his return to the United States he had one man shows in New York and Washington DC.
In 1953, Amen travelled throughout Italy. This resulted in a series of eleven woodcuts, eight etchings and a number of oil paintings. One of these woodcuts, Piazza San Marco #4 and its four woodblocks constitute a permanent exhibit of block printing in colour at the Smithsonian Institution. Travel in Israel, Greece and Turkey in 1960 led to a retrospective show at the Artist's House in Jerusalem.
|Piazza San Marco #4|
|1950 Times Square #4|
|1954 Piazza San Marco|
|1954 Rialto and Bridge of Sighs|
|1954 Slaughtered Houses|
|Girl with a Ball|
|In My Father's House Are Many Mansions|
|Many Children Dwell in My Father's House|
|Pensive Girl #6|
|Piazza San Marco #1|
|The Basket Offering|