I support any procedure that allows photographers to express themselves, whether that involves color, black and white, platinum, palladium and digital technology.

I never wore a tie voluntarily, even though I was forced to wear one for photos when I was young and for official events at school. I used to wrap my tie in a newspaper, and whenever the teacher checked I would quickly put it on again. I'm not used to it. Most Bolivians don't wear ties.

I don't want to do panel games or adverts. I really like challenges. I always get roles as an art teacher or a photographer. In the future I want to play something like a mugger/assassin/pastry chef.

I try to photograph with love and sympathy.

The most important thing you learn as a sports photographer is anticipation - not where the action is taking place, but where it's going to take place. Not where the subject is now, but where they're going to be.

The ostensible subject of my photographs may be motion, but the subtext is time. A dancer's movements illustrate the passage of time, giving it a substance, materiality, and space. In my photographs, time is stopped, a split second becomes an eternity, and an ephemeral moment is solid as sculpture.

Drones ply the liminal space between the physical and the digital - pilots fly them, but aren't in them. They are versatile and fascinating objects - the things they can do range from the mundane (aerial photography) to the spectacular - killing people, for example.

I've always loved airplanes and flight. The space program was really important to me as a kid. I still have a photo of Armstrong and Aldrin on the moon in my living room.

As photographs give people an imaginary possession of a past that is unreal, they also help people to take possession of space in which they are insecure.

Most whale photos you see show whales in this beautiful blue water - it's almost like space.

The photographs of space taken by our astronauts have been published all over the place. But the eye is a much more dynamic mechanism than any camera or pictures. It's a more exciting view in person than looking at the photographs. Of course, I personally am sick and tired of hearing people talk like that: I want to see it myself!

I'm never going to go to Mars, but I've helped inspire, thank goodness, the people who built the rockets and sent our photographic equipment off to Mars.

If there's a photo of a roomful of kids I'm the one with the biggest smile or my hand over my face.

Seeing photographs of my dad, Bert, on the beach with a knotted handkerchief on his head to avoid getting sunburn still brings a smile to my face.

Mary Peters. When I was having my sulky, stroppy, bad loser phase I watched her at the Olympics. Sometimes she failed but always with a smile and good grace. She taught me how to win and lose, and I have a photo taken with her in my lounge.

People think that when they come up to me, screaming things into my ear, that I will respond according to what they want. I'll turn around and smile and take the photo. But I'm not somebody's marionette.

So many girls second-think their pose or what they're doing. And, in turn, the photos will come out really unnatural. I say to really give the camera a performance - that, and make sure you're comfortable with how you look, and give it a good smile and a filter.

In New York, I have a photo of my parents on their wedding day in 1947. They're beaming at home plate in Houston's Buffalo Stadium. I love the photo because my dad is smiling. He didn't smile much in his later years.

Sometimes when I'm being photographed, I hear the voice of this photographer who told me when I was about six while he was taking my school photo that I didn't have a nice smile, and I shouldn't smile in photos.

I'm happy to help Crest Whitestrips on their mission to inspire photographers everywhere to capture smile moments and would encourage aspiring photographers to express themselves through their photos.

One study found that people who smile in childhood photographs are less likely to get a divorce.

You can always tell folks from nonfolks. Folks like to feel good, like to smile for the camera when there's a big photo opportunity for a really good cause.

Smiles come naturally to me, but I started thinking of them as an art form at my command. I studied all the time. I looked at magazines, I'd practice in front of the mirror and I'd ask photographers about the best angles. I can now pull out a smile at will.

If somebody asks for a photo, with a smile, it is nothing.