Karr has been involved in many investigations including faith healing, UFOs, firewalking, ghosts and others.

After graduation from University at Buffalo with a political science degree,[1] Paul Kurtz hired Karr full-time as the assistant public relations director.

In 2012, Karr was awarded for his 25 years of service and recognized as honorary Trenches winner at the Skeptic's Toolbox.

[3] He has been involved in many investigations including remote viewing, ghost hunting, firewalking, UFOs, Satanism and faith healing.

"[6] Karr feels that holding a belief in the supernatural and superstition can "detract from the advancement of the human race".

People want to make decisions rationally but to do that they need to be aware of science and technology, that does not mix with the supernatural.

During one event, Karr pretended to have back problems and limped to his seat heavily leaning on a cane.

[4] According to Karr, the Committee for the Scientific Examination of Religion sent investigators to Popoff's faith healing sessions in Houston and San Francisco.

The investigations led by James Randi used more than $20,000 worth of scanning equipment and "were able to intercept the frequency and tune in to what was being said".

They discovered that Popoff was being fed information by his wife who was using hot-reading based on cards that people had filled out when they arrived at the faith healing event.

Karr said that one member of the Bay Area Skeptics, Don Henvick, "has been healed five times by Popoff.

"[11] During a documentary on the Happy Hunter faith-healer husband and wife team, Karr interviewed people who had attended a service.

[4] From March 21 to April 3, 1988, Karr along with other members of CSICOP visited China by invitation of Lin Zixen who was the editor of Science and Technology newspaper in Beijing.

The CSICOP committee traveled to Xi'an and Shanhi where they gave lectures answering many questions from "crowds of people" who showed a lot of enthusiasm.

The committee had the qigong master exercise his powers at "regular intervals depending on the flip of a coin".

"[1] In Xi'an and Shanhi, the committee tested children who were reported to be able to see through envelopes and repair broken match sticks without touching them.

In 1987, he received a call from a woman who claimed that ghosts turned on her water faucet, looked into her second story window, and then finally threw a Happy Meal across the room.

He finally told her that as the ghosts had not harmed her or her family, they were unlikely to do so and to call back if anything else happened and he would personally investigate.

"[17] "Clients often strain to connect psychics' general statements with specific incidents in their lives.

[27] In 1984, CSICOP began sending letters to newspapers asking them to carry a disclaimer when printing horoscopes.

"It may seem [like] full moons spur weird occurrences... research indicates otherwise" many surveys have shown that there is no change in homicide rates to support that claim.

[5] Interviewed by The Oregonian, Karr related that one of the successes of CSI had been an investigation into seminars led by self-help gurus claiming they can firewalk because of their mental skills.

"[30] He says that urban legends "fulfill society's demand for gossip and rumor, reinforce or validate beliefs and inspire talking about shared unexplainable experiences.

And since they reveal taboos and obsessions, Karr said American urban legends tend to be about death, cars, hygiene or money.

"[32] he says that "The notion of Harmonic Convergence is a beautiful idea, the joining together of multitudes of people, all concentrating on the very noble desire for peace and harmony.

"[35] Karr feels that crop circles are "man-made things that caught on like Hula Hoops or Pet Rocks and got kind of a life of their own... like any other fad, it'll die out eventually".