Virginia Commonwealth University’s new Parkinson’s initiative will be led by a veteran researcher who believes no single thing triggers the disease that causes debilitating, gradually worsening tremors. While much of Dr. James P. Bennett Jr.‘s research focuses on the role of the energy-producing components of cells called mitochondria, those working with him are pursuing a range of theories and possible treatments—even a type of low-level light therapy studied so far in cells in laboratory dishes.