Sir Jackie Stewart, Officer of the Order of the British Empire, once shut down the Green Hell. The year was 1970, a year after Stewart won his first World Championship, a year before he would win his second. Despite the death of Piers Courage at the Dutch Grand Prix, race officials in Germany refused to listen to Stewart and make the safety changes he suggested. So all of the Grand Prix drivers, all those names we speak about in lauded breaths, boycotted the N\u00fcrburgring Nordschleife. "In those days, 375,000 people came to the Ring for the Grand Prix,\u201d he said. \u201cI got death threats because of that.\u201dTom Kristensen, Knight of the Order of the Dannebrog, first won at the 24 Hours of Le Mans in 1997, driving a Porsche LMP car based on an orphaned Jaguar. That was his first victory. Two years later, he got behind the wheel of an Audi and won five years in a row. In 2003, he gave Bentley\u2019s resurrected program its only victory, with its Audi-related Speed 8. Two years later, he beat Jacky Ickx\u2019s record seven wins. (Ickx, one of Kristensen\u2019s racing idols, left him a voicemail congratulating him.) When Audi switched to its TDI-powered R10, he won in 2008; when Audi switched to its e-tron hybrid R18, he won in 2013. Finally, after competing at Le Mans longer than the youngest driver that year had been alive, he retired in 2014. He has won the 12 Hours of Sebring six times and holds the records for the most endurance wins by a single driver in France and Florida both. We sat down with this pair of knights—Sir Jackie at the Quail, Tom Kristensen at the Rolex Monterey Motorsports Reunion—to talk about the evolution of motorsport. We also asked what they loved about Monterey\u2019s car week, how to stay awake to a near-inhuman degree, and the Holy Grail of lost watches. (Namely, Jackie\u2019s.)Sir Jackie StewartR&T: Your campaign to improve F1 safety wasn\u2019t popular at first. Is there a moment where you noticed a sea change in being more widely accepted? Sir Jackie Stewart: I\u2019ve probably gone to more funerals than anyone you know. Almost every one of my friends died . We lost a driver every month for four consecutive months. we were still racing and driving through the flaming wreckage of the car, and you know who\u2019s been in the car, because you catch a glimpse. These are things that people don\u2019t appreciate. And then people say, \u201cYou\u2019re a chicken, because you\u2019re trying to make motor racing without danger.\u201d There\u2019s never not gonna be danger when you\u2019re going at 200mph.In the end we got it done. We\u2019re doing 220, 230 mph, and people are having accidents, but the cars are safer, the tracks are safer, the medical facilities are safer.R&T: Right after you retired in 1973, there was a huge explosion of racing technology. Was there a car or team that you would have wanted to drive for?JS: I never raced for Ferrari, I was one of the few drivers that chose not to. The Commendatore was a very special man. At the same time, Ken Tyrrell came along. And he was a very down to earth, practical man of high moral standards. I started to drive for him in 1967, until I retired in 1973. I was so linked to him that I didn\u2019t want to drive for anyone else. But the glamor of driving for Ferrari is very intoxicating. R&T: The \u201chalo\u201d system is now being tested in F1. Do you think that\u2019s a fitting reflection of your legacy going forward? JS: I think it\u2019s ridiculous not to have a halo thing. When a wheel falls off a car at high speed, the general trajectory is going to directly point at the cockpit, and therefore the driver, who currently is unprotected. So a halo makes sense to me. Today, F1\u2019s probably the safest sport in the world. So I\u2019m a supporter of the concept, and a halo should be produced. R&T: You\u2019ve been involved with Rolex for ages now, having been a Testimonee since 1968. What drew you to the brand?JS: I got my first Rolex that same year in Houston, Texas, and was very proud of it. At that time Rolex\u2019s adverts had a photo of the UN Building in The New York Times, and it said, "If you were speaking here today, you\u2019d be wearing a Rolex." And I thought, Wow. This is spectacular. That watch was stolen on an aircraft in 1986. I went in to the restroom to wash my hands, and I came back, saw the watch wasn\u2019t there, assumed Helen had it ... I never got it back. That was a bad day.I have 16 Rolexes. This is a rose gold Daytona, but not the latest Daytona. I\u2019ll wear my latest Daytona tomorrow at Laguna Seca—it was given to me by Rolex to celebrate 50 years of me winning the Monaco Grand Prix, in 1966, in a BRM. Tom KristensenR&T: As a driver, what are some of the challenges you\u2019ve had to get used to, and how do you overcome them?Tom Kristensen: I\u2019m always doing a lot of training. And the perks of being a race car driver is that you have a lot of time to do that. During Le Mans weekends you don\u2019t drink a lot of coffee. Water is not enough, so you need isotonics, or electrolytes, which was not there in the beginning when I was driving. I\u2019ve had cramps in the car. You can\u2019t do anything with a cramp. You lose control of your legs, and driving a race car, it\u2019s impossible. I had to pit, and a colleague of mine, who obviously wasn\u2019t ready to take over the car, was not ready, because I wasn\u2019t supposed to come in.You dig deep: Obviously it hurts when you get through the pounding, the G-forces, the seat is not optimized for you alone, etc. There\u2019s all these aspects of endurance racing that is gonna hurt. But you want to win respect, you want to win, and there\u2019s the pressure because the mechanics and the engineers and the team have worked so hard to get you where you are.There\u2019s also people saying, \u201cLe Mans, it\u2019s such a long race, don\u2019t you get tired? Don\u2019t you get sleepy?\u201d But when you have a high pulse rate—150- in a race car—you\u2019re absolutely on it. R&T: Who inspires you? TK: My dad was my determination. I wanted to get his respect: He was driving competitively in saloon cars. I was inspired by Jacky Ickx and going to different classes, Ayrton Senna—they\u2019re all of that period. I was only six years old when Jacky retired. Mario Andretti: I took a picture of him in 1977 at Anderstorp when I was nine years old. He was humble, and he was respectful of my achievements at Le Mans. Winning F1, winning IndyCars—he did everything, but unfortunately he didn\u2019t win Le Mans. I gave him one of my victories. R&T: You just came back from driving the 2005 Audi R8 race car, which you won with at Le Mans. How did the R8 feel? TK: It was wonderful. They brought out a new set of Michelin tires for the car; they had to remanufacture them, so these R8s can run at these events again. Cold. So when I left the pits, I was fishtailing all the way up the hill, and when I got to fourth gear I said, \u201cCold brakes as well!\u201d Turn in, understeer, cold front tires, and halfway through, the tires, they gripped, the rears stuck, and two corners, it felt like love. Like home to mama. I\u2019d just like to add that I was wearing my watch today when I did my lap in the iconic Audi R8. And it was nostalgic. When I drive the historic cars, I have the watch on. When I was racing competitively, every little gram you could take off your body going into the car, the engineer would tell you—so if you went in with a watch on, you would be told at the briefing later that it held you back. When we take the overalls off, we\u2019ll put on a Rolex Daytona. The watch was there next to my passport. It\u2019s twelve years ago since that car drove, and fifteen years since I left this circuit with the fastest lap. It was great to see the people come out to the pit lane. I had a tear in my eye, but that was the wind. R&T: Did you have an interest in watches before Rolex?TK: I would say so. I\u2019ve been fascinated by watches, and that\u2019s why I was so humbly proud of joining Rolex, finally, before the end of my career. I had worked with other manufacturers earlier, but it was a bit like what I felt with Audi, when I joined: I felt home. I\u2019m representing my sport, my determination, my passion.