Nicholas Brewster Sohl is a fictional character in Larry Niven

Larry Niven

Laurence van Cott Niven / ˈlæri ˈnɪvən/ is an American science fiction author. His best-known work is Ringworld , which received Hugo, Locus, Ditmar, and Nebula awards. His work is primarily hard science fiction, using big science concepts and theoretical physics...

's Known Space

Known Space

Known Space is the fictional setting of some dozen science fiction novels and several collections of short stories written by author Larry Niven. It has also in part been used as a shared universe in the Man-Kzin Wars spin-off anthologies sub-series....

universe.

A Belter

Belter (Niven)

In Larry Niven's fictional Known Space universe, a Belter refers to a resident of the Asteroid Belt around Sol, sometimes known as the Sol Belt to differentiate it from Alpha Centauri's Serpent Swarm....

, born in the mid 21st century, he is First Speaker for the Belt Political Section when Phssthpok the Pak Protector

Pak Protector

Pak Breeders and Pak Protectors are two forms of fictional life in Larry Niven's Known Space universe. The Pak first appeared in "The Adults," which appeared in Galaxy in 1967; this story was expanded into the novel Protector by Larry Niven...

 arrives in the Solar System

Solar System

The Solar System consists of the Sun and the astronomical objects gravitationally bound in orbit around it, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago. The vast majority of the system's mass is in the Sun...

 in the early 22nd century.

Together with Lucas Garner

Lucas Garner

Lucas Launcelot Garner is a fictional character in Larry Niven's Known Space Universe.Born in 1939, he lived well into the 22nd century. This was because advances in medical science kept pushing his life expectancy ahead of his age...

they track Phssthpok and Jack Brennan to Mars, where they find Brennan has become a protector himself (and has killed Phssthpok).