1900
A Holiday Tradition Begins
OTSC hosts its first Holiday Luncheon.
Chicago’s Ad Community Steps Up
The Advertising Club of Chicago becomes an early supporter of OTSC.
A Partnership to Last Generations
The Chicago Advertising Association begins its longstanding support of the club.
1910
A Steady Place in Unsteady Times
OTSC stands strong as a stable community resource throughout World War I.
1920
Backed By A Business Titan
Julius Rosenwald, part-owner and chairman of Sears, Roebuck and Co., becomes an important early supporter and benefactor of OTSC.
1930
1940
A New Camp Tradition Begins
Camp Mark Twain (later renamed Camp Mathieu) opens in Wheaton, IL.





