regressionist

noun3

1. •
   One who carries out regressions, inducing a patient to act out behaviour typical of an earlier developmental stage.
2. •
   One who promotes or follows regressionism.

   • This politician is a regressionist who disregards what people care about now.
3. •
   One who travels back in time.

   • She, too, was a past-life regressionist. I asked, “Do you remember if you had a lifetime in connection with Nazi Germany?” She replied, “Oh, I thought you knew. I was a prison warden at Auschwitz. […] — 2010