Richard Divenuto is a New York-based entrepreneur and consultant in finance, biotechnology, and nutraceuticals who supports research on allogeneic chimeric antigen receptor T cells. Memory T cells are crucial for immune responses, developing after exposure to infections and differentiating into effector T cells to fight those infections. The document discusses the three main subtypes of T cells: naive T cells, central memory T cells, and effector memory T cells, each with distinct roles in immune function.