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The I.T.A.G. (International Trepanation Advocacy Group), founded in 1997 by Peter Halvorson, aims to provide information about the procedure.
From 2000 to 2004, I.T.A.G. established relationships with medical facilities and funded a pilot study involving 15 volunteers undergoing elective trepanation in Mexico.
Interviews with Halvorson reveal that the medical team overseeing the procedure was led by Dr. David Kirsch Kleiman.

Halvorson, who underwent trepanation himself in 1972 in Amsterdam, also became a prominent advocate for the cause, even demonstrating the procedure on ABC’s 20/20 in 2000.
Halvorson, together with Amanda Feilding, co-authored a series of studies on the dynamics of cerebral blood flow and cerebrospinal fluid.

The quest for scientific evidence of the effects of trepanation has not prevented I.T.A.G. from actively assisting people interested in undergoing the procedure. In fact, even today, it continues to facilitate operations abroad in a form of medical tourism, with details—travel, facilities, staff, and costs—readily accessible.