With 130 autonomous Chevrolet Bolts running tests in California and Michigan, and a new manufacturing system up for Cadillac's CT6 on two continents, General Motors is putting into motion many of the manufacturing techniques that will help define its future. Overseeing all this is Alicia Boler Davis, a 23-year manufacturing veteran who's enjoyed a meteoric rise from managing various GM plants to becoming one of the automaker's top executives.