Clodfobble, you are referring to
Dr. John Money.
He tried to prove his theory that gender identity was socially conditioned on one
David Reimer. He made an ideal "test case" because he came with a built-in control: a twin brother.
To his dying day (in 2006), Dr. Money insisted that his case study was valid and proved his point even as other doctors and researchers, not to mention the Reimer family, proved otherwise.
I consider the man a modern-day Dr. Frankenstein. He should have been prosecuted for child abuse, improper conduct, possession of child pornography and a host of other charges.