machinimator 

A person who make machinima movies.

This is the most common current usage, however historically, machinimist was popular, and the word machinimatographer is more likely to be used for second life machinimators

Machinimators use a variety of games engines and specialist tools to create their films.

machinimator by kerfoofle November 8, 2010

Machinimate 

To animate or puppeteer video game avatars for a machinima.

"Since Geoff Ramsey got shot in the face, who's going to machinimate Griff in Red vs Blue?"

Machinimate by Mr. Doubaley February 5, 2010

machinimating 

The act of creating a piece of machinima

Burnie was machinimating for those guys. What quality work!

machinimating by Paul Conley February 3, 2007

Machinimatographer 

Alternative to machinimator most often used by Second Life film makers.
Derived from Machinima and cinematography
A person who makes machinima movies.

Insertyourownnamehere is such a wonderful machinimatographer, she has won many awards and has many fans.

Machinimatographer by kerfoofle November 8, 2010