Lord Voldemort, he is a very powerful wizard who uses spells most wizards wouldn't ever attempt.
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Snape follows Lord Voldemort because he needs to know what he is up to so he can report to the portrait of Dumbledore, hanging in his office.
Actually it all starts with Dumbledore and Proffesor Trelawney. Trelawney wasnt a teacher at the time and had applied for the job. They both met at Hog's Head( a place in Hogesmade). When Dumbledore was interviewing Trelawney, she went into a trance and made the prophecy. She had only started but a Death Eater was also present at Hog's Head at the time. This Death Eater was Severus Snape. (That time he was Voldemort's true servant and not a spy for Dumbledore)Snape had heard only part of the prophecy before Dumbledore had realised he was there. Snape escaped and told Voldemort the only part he had heard(the first half). Voldemort set out to analyse the prophecy. This is all Snape had heard from Trelawney: "The one with the power to vanquish the dark lord approaches.....born to those who have thrice defied him...born as the seventh month dies...the dark lord will mark him his equal but he will have power the dark lord knows not........" Had Snape known that Voldemort would think it was Lily Potter's son, he would not have told him what he had heard.
Yes. Severus Snape was bullied by James Potter and his friends who despised Snape and his friends for bullying muggle-born students. James later joined the Order while Snape became a death eater making them enemies who fought for different sides in the war. James also married Lily Evans, the girl that Snape always loved.
Lord Zedd
Voldemort always wanted to teach Defence Against the Dark Arts but Dumbledore refused to give him a job. Voldemort then cursed the position so nobody could hold it for more than one year. In the 1991/1992 school year he shared Professor Quirrel's body. Quirrel taught Defence Against the Dark Arts.