Kevin Burkhoff

Season Two Kevin first appeared in the season two premiere episode "Wake Up Call," in which he was a patient in a psychiatric hospital. Kevin suffered from paranoid personality disorder and had not spoken in six years, and was friends with a schizophrenic 4400 named Tess Doerner. Tess used her 4400 ability to get everyone in the hospital to build a machine she saw in her mind, mistakenly believing that it would contact the future. When the machine was built, it created a pulse that released everyone from Tess' mind control and cured Kevin of his mental illness. It was then revealed that Kevin was a world-renowned neuroscientist and likely the "father of the 4400 technology".