Sam Fisher is a veteran of a hundred silent wars. He has been one of the most experienced field agents in the U.S. Intelligence network. He was a member of the U.S. Navy SEALs and the CIA before. Fisher is an expert in stealth tactics and proficient in both armed and unarmed combat. He operates almost exclusively at night and always works alone in the field. He can speak a startling number of foreign languages including Russian, Korean, Arabic, Chinese, Persian and Spanish.

Personality-wise, Fisher is abrasive and honest, and has little patience for niceties and even less for lies, especially when the immediate problem presents itself. He is quiet, instinctive, and observant, somebody who watches from the outside. Unlike younger agents, he is not a blind idealist, only taking to task if the cause is just and within reason.

Though fully aware and confident of his abilities, Fisher understands that his survival has often been a gift of chance. He knows he is human and fallible, and he does not want to die. He has a strange and slightly dark sense of humor. Constant training have defined his adult life. His tactical experience has become part of his instincts. Now, even outside of work he is most comfortable on the fringes of society, keenly observant but still removed.

But in order to achieve the discipline necessary for his work, Fisher has had to bury certain parts of himself. His ability to detach himself emotionally from the immediate situation in order to better achieve his goals is a prized skill. A man of few words, he is truly himself only when he is on the job – he has, in a sense, become what he does. He has acquired an admirable collection of scars and secured his place in Valhalla, and he has little left to prove to the world. Now older and wiser, he has no interest in glory. If he fights, it is because he believes the cause is necessary and he is capable of provoking positive change.