Jean Twenge

Jean Marie Twenge (born August 24, 1971) is an American psychologist researching generational differences, including work values, life goals, and speed of development. She is a professor of psychology at San Diego State University, author, consultant, and public speaker. She has examined generational differences in work attitudes, life goals, developmental speed, sexual behavior, and religious commitment.

She is also known for her books iGen, Generation Me and The Narcissism Epidemic. In the September 2017 issue of The Atlantic, Twenge argued that smartphones were the most likely cause behind the sudden increases in mental health issues among teens after 2012. Twenge co-authored a 2017 corpus linguistics analysis that said that George Carlin's "seven dirty words you can't say on television" were used 28 times more frequently in 2008 than in 1950 in the texts at Google Books. Twenge said the increase is due to the dominance of self over social conventions.