He then returned to Portland and continued his work in landscape architecture .
Graduating with a master 's degree from Columbia University in 1915 , Otten served in the United States Army during World War I and studied at the University of Montpellier in 1919 .
Otten then returned to Portland and continued Otten 's work in landscape architecture .
Graduating with a master 's degree from Columbia University in 1915 , Otten served in the United States Army during World War I and studied at the University of Montpellier in 1919 .