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Ambassadors

DR.MARK ERDMANN

Mark is a world-renowned scientist and marine conservationist. He completed his undergraduate degree at Duke followed by a PhD from Berkeley, Mark holds the record of the discoverer of the most species of fish with over 220 recorded and cataloged. He has also published over 180 scientific papers and 5 books including a 3 volume set on Reef Fish. His work has appeared on the cover of Nature and he is globally recognized as a leader in both Marine Biology and Conservation. He has logged over 16000 dives in just about every region of the planet including Antarctica. He is a Vice President at Conservation International and the Director of ReShark and Re:Wild. Mark is passionate about the protection and rehabilitation of Marine Environments and has lead efforts to establish Marine Protected Areas especially in SW Asia. He is the perfect person to test outdoor equipment especially waterproof gear.

DR.RICHARD HARRIS

Harry is an Australian anesthesiologist and Lieutenant Governor of the State of South Australia. Harry has a list of remarkable achievements including his critical role in rescuing the Thai soccer team from the flooded Tham Luang Cave in 2019. Against all odds (which also happens to be the title of his book on the rescue) Harry and a small international team had the entire world gripped for 2 weeks as they achieved a ‘miracle’ rescue of 13 boys.  Harry was featured in the NatGeo film ‘The Rescue’ documenting the success. Harry was named Australian Of The Year in 2019 along with his friend and dive partner CraigChallis. In scientific circles he is known as ‘Hydrogen Harry’ for his work using hydrogen on rebreathers which took him to a record depth of 245m (804ft). He has authored  ‘The Art of Risk’. Harry also races cars and participates in amazing extreme expeditions. Few are as qualified as Harry to test equipment to its limit.

Robbie — Ambassadors | Chalk Outdoor

Robbie Schmittner

Robbie Schmittner is an expedition leader and explorer based on the Yucatán Peninsula, where he has spent decades pushing the limits of underwater and cave exploration. As the founder of Robbie Schmittner Expeditions, he leads multidisciplinary projects focused on understanding subterranean freshwater systems, their origins, flow paths, and vulnerabilities — and how human impact affects connected ecosystems. He has quietly and humbly mapped over 500km of cave systems where he was the first human to enter them.
Robbie works at the intersection of adventure, science, and conservation, collaborating with international researchers, universities, and institutions while operating in some of the most remote and demanding environments on the planet. For him, exploration is not about records, but about responsibility: using experience, precision, and resilience to protect the unseen systems that sustain life above ground.

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