Polkowski

Polkowski was Henry van Statten's chief aide in 2012. He warned his boss against having the president of the United States replaced. In response, van Statten fired Polkowski and ordered him mind-wiped and left in an alley in a city beginning with the letter "M". He was replaced by Diana Goddard. Ironically, Diana would later go on to fire van Statten in the same manner he had fired Polkowski. (TV: Dalek)

Behind the scenes
In the online game The Last Dalek, which presents an alternate version of the events of Dalek, Polkowski does not appear, but he has an entry in the Dalek's memory files. He is described as "Male subject. Age 30. American. Van Statten's chief aide. Weak willed and careless. Considered no threat."