In 1912 in Berlin, he practiced wood sculpture with
Ludwig Vordermayer. From 1917 to 1922, he studied mechanics and worked as a blacksmith's apprentice. After studying woodcarving and sculpture with sculptor
Harold Isenstein, he attended the
:de:Kunsthochschule Berlin-Weißensee (Municipal Art School Berlin-Weißensee), majoring in sculpture and ceramics. During his studies there, he met
Hedwig Grossman, whom he later married. In 1928-1930, Lehmann worked for Holzmann's Stone Mason and Carving company. He became a freelance stonemason and sculptor for museums around Germany, including the
Pergamon Museum in Berlin, and worked in terra cotta at Hedwig's ceramics workshop. In the summer of 1933, Lehmann immigrated to Mandate Palestine with his wife and settled in
Haifa. They established a ceramics testing laboratory at the
Technion in Haifa and settled on
Kibbutz Yagur in 1935, where they established a flower pot factory. In 1937, the couple opened a sculpture studio in
Jerusalem, where Lehmann produced miniature carvings from olive wood, ivory, horn and gemstones sold as tourist souvenirs. From 1945 to 1947, Lehmann worked for the
Haganah, building models and ballistic implements. In 1947-1948, he joined the
Jewish Agency's Self-Defense Planning Committee. In 1953, he helped to found the
Ein Hod Artists' Village, where he taught sculpture. Among his students were
Yigael Tumarkin and
Menashe Kadishman. In 1959, Lehmann and his wife moved to
Givatayim where he established an art school under the auspices of the Givatayim municipality. The school held classes in sculpture, woodcuts and ceramics for young people and adults. Lehmann's work was influenced by the
Canaanism school of Israeli art. which attempted to create a direct relationship with the
Land of Israel by emphasizing simple shapes and motifs from the sculpture and ritual art of early Middle Eastern civilizations. He died in 1977. ==Awards and recognition==