In the late 1960s, who proposed that South African food-foraging people actually had more leisure time than early farmers?

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Lee and DeVore proposed in their 1968 paper titled "Eating Christmas in the Kalahari" that South African food-foraging people actually had more leisure time than early farmers. They argued that the !Kung San people have a diet that requires only about 12-19 hours of work per week, leaving them with plenty of leisure time to engage in social and cultural activities. This challenged the prevailing idea that early farmers had more leisure time than foragers.

In the Late 1960s, Who Proposed That South African Food-Foraging