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Tech Diving Limited Staff
is made up of career industry professionals with more than 100 years of collective experience in diving, technical diving, training, dive safety and medicine, equipment manufacturing, distribution, exploration, expeditions, and dive travel. Our principals are industry leaders seeking to find better ways to serve our customers Each of our highly trained staff are readily available to answer your questions.



Joel Silverstein, Vice President, COO

Since 1988, Joel has completed over 6,400 dives. More than 3,000 have been on shipwrecks all over the world. He has extensive experience with un-teathered mixed-gas diving in the open ocean. At TDL he is responsible for corporate decisions, product selection and placement, technical diver and instructor training, and heads up our expedition diving division. Joel also handles the critical aspects of the company's marketing and positioning within the industry. With all he does he is always available to talk with you about diving and gear



Capt. Kathy Weydig, President

Kathy has more than 4,000 dives exploring some of our more notable shipwrecks including the Andrea Doria, USS Wilkes Barre, an Expedition Leader on USS Monitor projects and permit holder for the B-29 Bomber in Lake Mead. She is an active Instructor Trainer with SDI/TDI and a founder of the Women Diver’s Hall of Fame. She has been a scuba instructor since 1989 and holds a 100 ton USCG Master captain’s license. She has served on the Board of Directors of the Divers Alert Network for more than ten years. Kathy handles training and public relations integration at TDL and is always available to talk about community involvement.



Scott Monnier, General Manager

"Mr. Scott" is a NAUI Course Director and scuba instructor for more than twenty years. As the founder of Tech Diving Limited he envisioned a company that would bring specialty products to a unique marketplace. Mr. Scott heads up company operations and oversees product acquisition, testing and evaluation. In addition Mr. Scott leads our service department ensuring all equipment is serviced to the highest factory specification. You will find Mr. Scott at TDL headquarters most every day unless he is underwater.



Jona Silverstein, Manager Information Technology

Growing up in a dive family Jona breathed on scuba as early as three years old, he was mixing gas by seven, and has been a certified SDI diver since nine. He is actively involved in hiking, climbing, mountain biking, boating, sailing, water-sports, and competitive shooting. Jona earned the rank of Eagle Scout at fourteen and aspires to earn his degree in computer hardware engineering. Jona heads up the internal and critical aspects of the company's information technology, security, and database management.



Captain John Fuller, B-29 Expedition Leader

Captain John has been with TDL since 2005. He is a lead instructor for the company with SDI/TDI and is actively teaching divers. His expertise is in running technical diving operations in the Southwest and has been the lead Captain on the B-29 Bomber dives in Lake Mead since 2006.




Tom Hansen, Manager Local Charters and Training

Tom is an active SDI/TDI instructor he has been with STT/TDL since 2015 and heads up our local recreational training and dive charters. In addition Tom is our go-to guy for underwater salvage and recovery. If it's lost underwater he finds it, if its in the way he moves it. His passions are restoring antique cars and customization of new vehicles.




Rob Neto, Website Technologies, Side Mount Instructor.

Rob has been a senior consultant with TDL since 2006. He was instrumental in the development of the TDL website and manages web coding and database management. Rob is the nation's leading side mount cave instructor. He served as the NACD Training Director and can usually be found wiggling around inside Florida's and Cozumel's smallest cave passages. Rob is author of the Side Mount Diving Book sharing the inside techniques of this most versatile diving method. Based in Marianna Florida he also owns and operates Chipola Divers Jackson County's only full service cave diving center.




Nathan Adler, Social Media Coordinator

Nathan is a Social Media Specialist and Website Editor.An avid diver he loves to explore the rivers and lakes of the Southwest treasure hunting. An accomplished photographer and videographer he works with STT/TDL on developing and managing our social media presence. He has lived and worked in Lake Havasu City his entire life. He also works for the Lake Havasu City Convention and Visitors Bureau managing their brand and visual storytelling on Facebook, Twitter, Instagram and other online platforms.