Blank, Last, Moore, Noyce, and Roberts started working in April–May, and Kleiner, Grinich, and Hoerni came during the summer. By September 1956, the lab had 32 employees, including Shockley. Each successful candidate had to negotiate his salary with Shockley. Kleiner, Noyce, and Roberts settled for $1,000 per month; the less-experienced Last got $675. Hoerni did not bother about his payment. Shockley set his own salary at $2,500 and made all salaries accessible to all employees. Two of Shockley's choices later appeared to be mistakes: William Happ was proven insufficiently competent for the work, and technologist Dean Knapic had forged his university degree and certificate of military service. He later brought Shockley's technologies to competitors.