Nils Arbohm (1905-1997).
Trained as an architect at KTH in 1927, he then worked with Ivar Tengbom for five years. After meeting at KTH, Ahrbom & Zimdahl also established their joint architectural office in 1927. One of their first joint commissions was the girls' school at Sveaplan in Stockholm (now the School of Social Work) in 1931. Ahrbom held the professorship in architecture at the Royal Institute of Technology in Stockholm from 1942 to 1963.

Helge Zimdal (1903-2001)
Graduated from the School of Architecture at Kungliga Tekniska Högskolan in Stockholm in 1927 and from Konsthögskolan in Stockholm in 1930. He participated in the Stockholm Exhibition in 1930 with furniture and textiles, with some of the furniture created in collaboration with Carl-Axel Acking. At KTH, he met Nils Ahrbom, with whom he ran the architectural office Ahrbom & Zimdahl from 1927 to 1951. When Helge Zimdahl became a professor at Chalmers in 1951, he dropped the "h" from his surname and became Zimdal henceforth.