| 1930 |
| Advertising Age is launched in Chicago. |
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| 1932 |
| William Esty leaves JWT to start his own agency. |
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| 1936 |
| Life publishes its first edition. It later becomes the first magazine to carry $100 million annually in advertising. |
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| 1938 |
| Congress passes the Copeland Bill, which gives the Food & Drug Administration regulatory powers over the manufacture and sale of drugs. |
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| 1940 |
| Ted Bates leaves Benton & Bowles to start his own agency, taking the Wonder bread and Colgate dental cream accounts. |
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| 1942 |
| The War Advertising Council is organized to help prepare voluntary advertising campaigns for wartime efforts. The council garners $350 million in free public service messages. After the war it is renamed the Advertising Council. |
Ad Council |
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| 1946 |
| Frederic Wakeman's "The Hucksters" is published and becomes a bestseller and would later become a film starring Clark Gable. |
Archive Photos |
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| 1948 |
| Hewitt, Ogilvy, Benson & Mather is launched. |
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| 1932 |
| George W. Gallup joins Y&R as director of research and develops a widely syndicated opinion poll. |
Archive Photos |
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| 1935 |
| Leo Burnett leaves Erwin, Wasey to start his own agency in Chicago. |
Stephen Deutch |
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| 1938 |
| Radio surpasses magazines as a source of advertising revenue. |
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| 1939 |
| NBC experiments with a telecast of TV's first baseball game, Princeton vs. Columbia. |
NBC Photo |
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| 1941 |
| With 7,500 TV sets in New York City, NBC's WNBT begins telecasting July 1. The first TV spots, featuring a Bulova watch that ticks for 60 seconds, air as open- and close-time signals for the day's schedule. |
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| 1943 |
| Albert Lasker liquidates his stock in Lord & Thomas for $10 million, and it reopens as Foote, Cone & Belding. |
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| 1947 |
| JWT becomes the first agency to surpass $100 million in billings. |
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| 1949 |
| Doyle Dane Bernbach opens its doors. |
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