On June 27, 1976, Joseph Callan, a 54-year-old partner at Marvin Glass and Associates, was shot and killed at the company’s Chicago offices. Callan worked at a prominent toy design and engineering firm responsible for products such as Lite-Brite and Rock ’Em Sock ’Em Robots. Two other company partners, managing partner Anson Isaacson and designer Kathy Dunn, were also killed; two additional people were seriously wounded.

The attacker was identified as Albert Keller, a 33-year-old designer described as suffering from paranoid delusions. Reports say Keller’s mental health problems culminated in the office shootings; he died at the scene. No other suspects or arrests followed.

The murders had a profound effect on the firm and its employees and prompted discussion about workplace safety and mental health intervention. If anyone knew Joseph Callan, his work at Marvin Glass and Associates, or has information about the events at the office that day, please share what is known.