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“The future survival of humanity depends on the exploration and settlement of increasingly hostile environments on land, sea, and space.”

Guillermo Söhnlein is an explorer, entrepreneur, and philanthropist with a passion for space, oceans, and sustainability. He has launched over a dozen for-profit ventures and nonprofit organizations, while also organizing and leading several ocean exploration expeditions involving crewed submersibles. He is an advisor, mentor, consultant, and speaker on a variety of topics related to the exploration and sustainable settlement of extreme environments on Earth, underwater, and in space. 


Guillermo serves on the founding teams of several ventures and nonprofit organizations listed on the Portfolio page.


He also supports other entrepreneurs and philanthropists:

Board of Directors

Advisory Board


Admitted to The Explorers Club in 2012, Guillermo is also an expedition leader, submersible pilot, and scuba diver. Diving in Puget Sound, Monterey, Catalina Island, and Miami, his prior expeditions supported scientific efforts, collected valuable data, transported scientific personnel to key sites, generated volumes of content, and garnered mass media attention. In 2012, one noteworthy expedition discovered a previously unknown sunken WWII-era Grumman F6F Hellcat fighter plane that had been lost by the U.S. Navy 70 years prior.


Guillermo earned his A.B. in Economics from the University of California at Berkeley and his J.D. from the University of California College of the Law, San Francisco (formerly University of California Hastings College of the Law). He also served on active duty as an officer in the United States Marine Corps.

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