"His appearance was quite familiar to me. He is extremely tall and thin, his forehead domes out in a white curve, and his two eyes are deeply sunken in his head. He is clean-shaven, pale, and ascetic-looking, retaining something of the professor in his features. His shoulders are rounded from much study, and his face protrudes forward, and is forever slowly oscillating from side to side in a curiously reptilian fashion. He peered at me with great curiosity in his puckered eyes." Sir Arthur Conan Doyle in Memoirs Of Sherlock Holmes
This description of Sherlock Holmes’ arch-enemy comes from a chapter entitled Adventure XI. The Final Problem. While I am familiar with most television portrayals of Moriarty, I must say that Andrew Scott’s performance fit the bill perfectly.