In 1927 he came to Lithuania and worked at factories in Kaunas. Soon he started traveling and working across Europe. Until 1935 he worked as a consultant and helped to establish large companies in Barcelona, Brussels, Copenhagen, London, and Milan.
During this period he published his classic study printed in Geneva, Relationship in Organization in 1933. Soon other editions appeared in the United States. He mathematically proved that a manager should not have more than four to five subordinates.