Pat Presley is a freelance conceptual design artist who drew several creature and biome concepts for Subnautica. His designs for the former include the Sea Emperor Leviathan, the Reefback Leviathan, the Grand Reef and the Lava Castle.
Pat worked as a concept designer for Lucasfilm Animation for five years from January 2008 to May 2013. During which time he worked on the animated series Star Wars: The Clone Wars and Star Wars Rebels before leaving Lucasfilm.
He has also created artwork for Injustice 2.
Pat Presley's artstation account can be found here.