His radical aesthetic shift did not please his father , who denounced Maurer 's post-Impressionist canvases when they were shown in New York by Alfred Stieglitz in 1909 , five years before the Armory Show introduced Americans to European modernism .
Alfred Stieglitz
New York
/people/deceased_person/place_of_death
PERSON
Maurer
LOCATION
New York
PERSON
Alfred Stieglitz