As a sequel to her program on “Great Masters of 19th Century Photography” that she presented to PPA of PA in 2021, this coming October Monique will talk about the Great Masters of 20th Century Photography. Influential photographers in the 20th Century are so many that only a selection of those who had/have a critical impact on the discipline are included in the presentation. Among them we can name Joseph Stieglitz , who led the Secession Movement in the US in the early 1900s; Ansel Adams, whose zone system paved the way for our HDR technique today; Dorothea Lange, Walker Evans, Gordon Parks, and many others who worked for the Farm Security Administration documenting the Great Depression in the 1930s; Robert Doisneau and Henri Cartier-Bresson, French photographers among the first to document everyday life in whimsical street shots; Sebastiao Salgado, legendary Brazilian photographer whose B/W photos combine poignant realism with fine art; and in the science field, closer to us, Felice Frankel, who creates compelling photographs from renditions of complicated research and data sets. Many more of those talented individuals are discussed in the presentation. Their innovative work thoroughly transformed society in the 20th Century, making photography an indispensable tool of everyday life, whether it relates to information, education, research, business, social relations, or just plain fun.