Vytautas Andrius Graičiūnas (August 17, 1898 in Chicago – January 9, 1952 in Olzheras, Siberia) was a Lithuanian management theorist, management consultant, and engineer. Born to Lithuanian immigrants, he studied at the University of Chicago. During the World War I served in France. After coming back in 1919, he became interested in management and continued his studies at the Illinois Institute of Technology.In 1927 he came to Lithuania and worked at Kaunas factories. Soon he started travelling 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 classical study printed in Geneva Relationship in organisation in 1933. Soon other editions appeared in the United States. He mathematically proved that a manager should not have more than 4-5 subordinates.