Daniel Levinson (1920-1994) was one of the first psychologists after Erikson to develop a theory of adult development. In 1978, he published a book called Seasons of a Man’s Life, which was based on extensive interviews with men in several different occupations. In 1987 he published a book entitled Seasons in a Woman’s Life, using similar methodology with a sample of women. Even though his samples were small and largely limited to upper-income people, his thoughts about adult development are worth considering.