The story
From pro- + active; originally coined 1933 by Paul Whiteley and Gerald Blankfort in a psychology paper, used in technical sense. Used in a popular context and sense (courage, perseverance) in 1946 book Man’s Search for Meaning by neuropsychiatrist Viktor Emil Frankl, in the context of dealing with the Holocaust, as contrast with reactive.
Etymology from Wiktionary, CC BY-SA 4.0.