Dr Phil actually has a PHD or master's (can't remember which) in psychology, but if I remember right he's had his license to practice either removed or he hasn't done the due diligence on his part to maintain it. I can't remember which. Apparently he also did a lot of sketchy shit with his clients including forming relationships with them prior to his time on TV. Behind the Bastards did a multi-part series on him that's worth listening to.

The worst part about Dr. Oz is that he was an exceptionally skilled thoracic surgeon, apparently one of the best in a field we are severely lacking skilled practitioners in, and has done hundreds of operations. This is a man who has saved or extended hundreds of lives. He then gave all of that up to sell bullshit weight loss miracles to middle-aged moms. He literally stopped saving lives so he could actively harm others with his bullshit and questionable advice outside of his realm of expertise.

I'd argue that Oz has done more direct harm to people on a larger scale than Dr. Phil could dream of. Again, there is a multi-part series on Behind the Bastards covering him that's worth a listen.