sentences:  In her decades of service to the advertising industry, Lansdowne Resor is credited with a number of contributions which were pivotal in shaping the industry as a whole.As the first woman to both plan and develop national advertising campaigns, she became a conduit through which many women were able to enter the male-dominated field of advertising.Lansdowne Resor actively mentored young women, creating a women's editorial department within J. Walter Thompson Co. where women were encouraged to speak their minds.