I have the autobiographies of both men and they are superbly honest and well written. Hal in particular seemed determined to tell the truth at all costs. Interestingly both grew up without fathers yet ended up often playing patriarchal or authoritarian figures. Moreover both made it to their 90s with stage and screen careers spanning seven decades. Extraordinarly though it seemed they never actually worked together. though their paths must have almost crossed multiple times.
Each was an inspiration in his own right, but particularly Hal.