He was a master, leading the way for all sci-fi writers and filmmakers. He was also a warm and kind man. I spoke to him twice, some 45 years apart. Once as a 5th grader, cold-called him (he was listed in the phone book!) to ask him about his book that we were studying in school. I must have sounded like an idiot asking about symbolism and foreshadowing. He was amazingly welcoming and helpful. I had purchased his entire collection (paperback was all I could afford) and he personalized each one. Still on my bookshelf today. Then again I spoke to him two years ago, he was still kind and astute but his speech was suffering from the effects of a stroke. So sad. Huge loss for the literary world.