Who was the master of the Elder Wand after Dumbledore?
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Harry Potter
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Severus Snape
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Draco Malfoy
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Voldemort
In the Harry Potter series, the wand's allegiance changes when a wizard is disarmed. Draco Malfoy disarmed Dumbledore at the Astronomy Tower before Snape killed him, making Draco the true master of the Elder Wand. This allegiance is crucial to the final confrontation at Hogwarts.
When Dumbledore was killed, Draco Malfoy had actually disarmed him just before Snape cast the killing curse, meaning wand allegiance (per the Elder Wand's rules) passed to Draco rather than to Snape who struck the fatal blow. This is a key plot point Harry later exploits, since defeating Draco (by disarming him at Malfoy Manor) is what later makes Harry the wand's true master, not by fighting Voldemort or Snape directly for it.