Peter Dinklage
There is more information available on this subject at Peter Dinklage on the English Wikipedia.
Peter Hayden Dinklage (born June 11, 1969), known professionally as Peter Dinklage, is an American actor. Following his breakthrough role in the 2003 film The Station Agent, he has appeared in numerous films such as Elf (2003), Death at a Funeral (2007), and Ice Age: Continental Drift (2012). He is well known for his role as Tywin's dwarf son, Tyrion Lannister in HBO's Game of Thrones series, which has earned him both an Emmy and Golden Globe Award.
In Destiny, Peter Dinklage provided the voice of the Ghost that accompanies the player's Guardian. However, upon release of The Taken King expansion, his lines throughout the game were replaced by Nolan North.