Born in Będzin in Germany (today in Poland), Be'eri was one of a group of young men known as the "Six from Bedzin", who were later the founders of Migdal. Be'eri made aliyah to Palestine in 1921 and became a member of Kibbutz Artzi. He worked in construction until 1938. Between 1944 and 1945 he managed Israel Military Industries, and from 1946 to 1947 managed the Na'aman factory.