Warren Spector has announced that his 40+ year game development career has come to an end. The designer, known as one of the pioneers of the immersive sim genre thanks to his work on series such as System Shock, Deus Ex, and Thief, is stepping away from the industry. In a LinkedIn post, Spector is direct in stating his intention to retire, reflecting on his lengthy career while stating the reasons behind the decision. “I’m a month away from my 44th…