Katie Hallahan - is a video game writer and designer. Katie Hallahan began his career in 2013 and has worked for companies such as Phoenix Online Studios and Phoenix Online Publishing. Katie Hallahan's first game was Cognition: An Erica Reed Thriller which was released 11 years ago. Best Game Katie Hallahan contributed to was Cognition: An Erica Reed Thriller. Katie Hallahan's latest work is Cognition: An Erica Reed Thriller which was released 11 years ago.