Ian is brilliant and loves his work. During their first encounters, Ian and Charlie clashed: Charlie did not believe in using guns to solve problems and disdained Ian's dispassion about killing. In contrast, Ian thought Charlie's mathematic approach was too academic for real cases, and his scientific viewpoint made his objections to Ian's attitude hypocritical.
Ian is exceptionally skilled at his work and enjoys it immensely. Their first interactions were marked by a conflict: Charlie did not believe in solving problems with weapons and found Ian's indifference towards killing unsettling. Conversely, Ian thought that Charlie's mathematical methods were too abstract for practical cases and that his scientific stance made his criticism of Ian's attitude appear hypocritical.