According to some of his colleagues on "Doctor Who", Hartnell could be a difficult person to work with, though others, Russell and Peter Purves, and the producer Lambert, spoke glowingly of him. Among the more caustic accounts, Nicholas Courtney and Wills have accused Hartnell of being racist or anti-Semitic, though these are, by most accounts, frequently challenged by his love for his co-workers of different backgrounds. According to his granddaughter Jessica Carney, who wrote his biography, Hartnell could be very bigoted and often came out with xenophobic comments but "all those loudly expressed opinions were contradicted by his behaviour on a personal level". Hartnell adored Carole Ann Ford and Lambert who were both Jewish, and had great respect for Waris Hussein, who was Indian. According to Val Speyer, although Hartnell claimed not to like foreigners, "as one of his greatest friends on the show was half Greek and half Maltese, I didn't see how this could figure. However, if he liked someone, they weren't a foreigner, they were a friend!"