Ian Stevenson
Stevenson found that the best evidence supporting the belief in reincarnation comes from the cases of young children who, typically between the ages of 2 and 5, make statements about a previous life they claim to have had before being born.  Their statements are often accompanied by behaviour that is unusual for their family but appropriate for the life that the child claims to remember. There is often a "forgetting of the imaged memories between the ages of 5 and 8; a high incidence of violent death claimed in the claimed previous life; and mention of the mode of death by the subject".