Helen Bayless Lansdowne Resor was an American advertising executive with J. Walter Thompson Co. A noted copywriter, she was posthumously inducted into the Advertising Hall of Fame in 1967. Resor is credited as the first woman in American history to design and implement national advertising campaigns (source). She was named #14 on the list of 100 Advertising people of the 20th Century by Advertising Age.

J. Walter Thompson (JWT) was an advertisement holding company incorporated in 1896 by American advertising pioneer James Walter Thompson. The company was acquired in 1987 by multinational holding company WPP plc, and in November 2018, WPP merged J. Walter Thompson with fellow agency Wunderman to form Wunderman Thompson. In October 2023, WPP announced yet another merger in which Wunderman Thompson, along with another group agency VMLY&R, would cease to exist and create a new combined entity named VML. This is to be effective January 1, 2024.