For people seeking information here in the adult forum -
This is a cross-post of a link originally posted by MumOfThree to a discussion thread in the Parenting and Advocacy Forum:
Early College Entrance - radically early

Article link: https://www.davidsongifted.org/Search-Database/entry/A10421

A few web searches based on that article, yielded this:

1) Article is backed up on the WayBackMachine, internet archive, here:
Archive: Underachievement in Exceptionally Gifted Adolescents and Young Adults: A Psychiatrist's View
(http://web.archive.org/web/2017*/https://www.davidsongifted.org/Search-Database/entry/A10421)

2) Author, Jerald Grobman, located here:
Psychotherapy Services for the Gifted - http://psychotherapyservicesforthegifted.com/
1044 Madison Avenue
New York,N.Y. 10075

3) Author, Jerald Grobman, related with this gifted website:
Gro-Gifted, Research & Outreach - https://www.gro-gifted.org/
A contact email address is provided on the header of each webpage.
IMO, this is a GREAT website to explore.