Michael Gambon — British Actor born on October 19, 1940,

Sir Michael John Gambon CBE is an Irish-born English actor who has worked in theatre, television and film. Gambon has played Philip Marlow in the BBC television serial The Singing Detective, Jules Maigret in the 1990s ITV serial Maigret, and Professor Albus Dumbledore in the last six Harry Potter films after the death of actor Richard Harris... (wikipedia)

I just play him as myself, I don't ease myself into any role really. I stick a beard on and play me.
I learn the lines that JK Rowling or whoever writes them, and say them.
Every part I play is just a variant of my own personality. No real character actor, of course, just me.
I'm an anorak. I've always been an obsessive collector of things. Richard Briers collects stamps. I collect cars and guns, which are much more expensive, and much more difficult to store.
I am a theatre actor, but the last ten years I've taken parts in movies because it keeps me in money.