Born: 21 February 1946, Hammersmith, London, England, UK
Died: 14 January 2016, London, England, UK (cancer)
I will say it right now - it pains me to see so many people knowing Rickman only by his role in Harry Potter movies. Such narrow-mindness should be shamed. Not only Rickman is much broader actor than that, he is, in his very core, a theater actor. It is said, at times he would even reject offers for movies to participate in theater performances.
Then again, it is true, that this British master of acting is known to us mostly for his movies. He was the one to play Hans Gruber, the iconic villain from the first Die Hard. But even though this was the role he was associated with for years to come, his could play all sorts of characters. Metatron from Dogma, Alexander Dane from Galaxy Quest, yes, obviously, Severus Snape from Potter movies, Judge Turpin from Sweeny Todd... list goes on.
And speaking of Todd. Not only Rickman possesses great acting ability, but he also has very distinctive voice. Listen to him singing together with Depp. Or just listen to the characters that he voiced like Marvin from Hitchhiker's Guide or Blue Caterpillar from Alice in Wonderland. He was genuinely pleasant even to just listen to.