Dr. Hudson is a KaneCo scientist and head of the Research and Development department.
Dr. Hudson was Jacob's student when Jacob and Kane were still partners. Hudson stayed in Deluxe when Jacob left. Kane started pushing them into more dangerous experiments.
During one particularly dangerous project to create an highly volatile power core, Dr. Hudson called the Burners to stop Kane from destroing Motorcity. After being rescued by the Burners and making amends with Jacob, Hudson now assumedly assists them in his new lab in Motorcity.