John Zaffis is Ed Warren's nephew. He was in on a couple of investigations. TAPS also investigated one house previously investigated by the Warren's.
TAPS does have a resident demonologists Carl and Keith Johnson.
The most painful for me was my very short association with the area "TAPS Family" ghost hunters. After debunking several very bad photographs from the hysterically gullible, I recieved one from a mother who had lost a child in an accident. Before the child died, a picture was taken in a smokey room. Some fans of the show and self proclaimed psychics saw an "angel" in the illuminated smoke and pronounced it as a "sign that the girl was now in the arms of angels." The mother asked my opinion. Of course I told her it was nothing but the flash illuminating passing smoke from candles in the foreground. The woman thanked me for being honest and regretted listening to the "ghost busters" in the first place. I could tell it brought back painful memories of losing her daughter.
What I can't stand about these self proclaimed paranormal investigators is they forget they are using, and many times hurting other people, while attemping to support their pet pseudoscience. While they are running willy-nilly with EMF meters and digital cameras, they scare the gullible out of their homes and prolong grieving of those who have lost someone dear. Fortunately for the world, a few days after this incident, this group of ghost hunters self destructed over some childish in-fighting.