This memoir gives a history of my archaeological research in Brazil and especially the theoretical issues, empirical interests, collaborations, and events that motivated it. I begin with my early course and field experiences as a student, my work as a museum curator and university professor, my research in literature, archives, and collections, and my early collaborations and interactions with other students and with scholars. Then I trace the relationship of my Venezuelan Orinoco dissertation work to my interest in the Amazon, and explain how that led subsequently to my field research in Brazil. I then summarize the work at the four regional foci of the project in the Lower Amazon of Brazil and point to what might be the theoretical implications of the results in light of the results of work by other scholars. I conclude with an explanation of how the Brazilian research relates to my preliminary research in Central Africa and conclude with the implications of the South American and African research for changing concepts of human evolution, human ecology, and culture history.