Horatio Hackett Newman (March 19, 1875 – August 29, 1957) was an American zoologist and geneticist who taught at the University of Chicago.

[1] Newman is also recognized for his research on multiple births in humans and other animal species.

That year, Time reported, "In the U.S. there are at least 2,000,000 people who are twins, triplets or quadruplets.

The man who gets asked most about them is Geneticist Horatio Hackett Newman of the University of Chicago.

"[3] Newman was also an outspoken defender of evolution, and traveled to Dayton, Tennessee to testify as an expert witness at the Scopes Monkey trial in 1925.