The reason I've been able to keep going for so long is because of how much I love my sport. I still haven't lost that drive. I'm still as passionate about my sport today as I was when I first laced up a pair of boxing gloves. I love preparing for battle and getting into that mindset you must reach when you're putting your body through torture in training camp.

Remember, if you sit at your desk for 15 or 20 years, every day, not ­counting weekends, it changes you. It just does. It may not improve your temper, but it fixes something else. It makes you more free.

I’m glad now I did it. It took up all my middle years. I started it in 1972, and I published it in 1988, and my middle years all went into it, but I am glad I put them into it. Otherwise I’d have just been writing newspaper stories. It’s a worthy profession. It’s a good profession, but the newspaper, after it’s published, is something to wrap the fodder in the next day. ... A book sits on the shelf, and I really wanted to do this. I’m glad that I had done it.

Sherry offered me a list of research options: the one project that intrigued me the most consisted of finding out the environmental fate of certain very inert industrial chemicals – the chlorofluorocarbons (CFCs) – which had been accumulating in the atmosphere and which at that time were thought to have no significant effects on the environment. This project offered me the opportunity to learn a new field – atmospheric chemistry – about which I knew very little; trying to solve a challenging problem appeared to be an excellent way to plunge into a new research area.

He gave me freedom at the age of 11, and told me that [I should] chase my dreams, but make sure you do not find short cuts. The path might be difficult, but don't give up, and I have simply followed his instructions. […] Every time I have done something special [and] showed my bat, it was [for] my father.