St. Mary's was the second of eight churches designed by Chicago architect Joseph Molitor. Molitor's career in Chicago was brief for there is currently no evidence of any other commissions after 1915. He died August 26, 1917, of what is speculated of the Great Influenza Epidemic after World War I.
Nevertheless, it is important to recognize that Molitor is among the best Catholic Church architects Chicago had to offer in the early 20th century. He used a blend of Romanesque and Renasissance Revival styles with trace elements of Byzantine and Baroque, representing late 19th centrury and early 20th century American religious architecture.
Joseph Molitor, Architect
Moreover, it appears that the St. Mary's commission sparked the greatest "creative burst" of Molitor's careed which left an indelible mark on Chicago's great religious architecture.