Who conducted experiments with human babies analogous to Harlow's monkey experiments?

Question

Many people seem to know that these happened, but no one can remember who was responsible for them. Additionally, the details often vary, so maybe there were multiple instances of similar experiments?
Information on Harlow's experiements can be found at http://en.wikipedia.org/wiki/Harry_Harlow if you are unfamiliar with the subject.

Specifically, experiments on orphans which would generally be considered cruelty by today's standards.

Answer 1

John Bowlby and Mary Ainsworth

See:
http://www.wotjik.com/anti-virus/glossary/john-bowlby-attachment-theory.htm