About Us

Mark A. Gresham is the current owner, President & CEO of Professional Scuba Inspectors, Inc.-Professional Cylinder Inspectors, Inc. (PSI-PCI)

Mark began diving as a young boy with his father in Ginnie Springs, FL. Thus began a lifelong passion for scuba diving and the industry. While in the USMC he became a certified diver. He was certified as a PADI Scuba Instructor in 1994 and certified as a PSI Cylinder Safety Inspector in 1996. He was certified as a PSI Inspector Instructor in 1999 and currently is one of only two individuals authorized to train cylinder safety Instructors within the PSI-PCI organization. 

As a PSI-PCI instructor, Mark has conducted countless inspection and safety seminars for dive stores, dive clubs, public forums, hydro re-qualifiers, fire departments, all military services, cylinder manufacturers, NASA, NOAA and in support of industry trade shows.

With Bill High, founder of PSI, Inc. as his mentor, Mark became a member of the PSI Executive Team in 1999 and thereafter contributed directly in the development of scuba cylinder safety guidelines, training materials and published cylinder safety bulletins. He is the co-author of the 5thedition gas industry recognized book, INSPECTING CYLINDERS. Upon Bill’s “semi” retirement, Mark became the owner of PSI, Inc. in 2004. 

Mark is the most knowledgeable cylinder inspection and safety authority in the world today. He provides technical information to cylinder manufacturers, the US Department of Transportation, Compressed Gas Association, fire associations, NOAA, NASA and many other pressurized gas users. He works closely with government and industry investigators of high pressure cylinder related accidents. 

Mark worked with industry experts and specialists to develop the widely recognized training programs for oxygen cleaning of scuba cylinders (the protocol used now by NASA), maintenance and service for scuba valves, and an eddy current instrument technician class. 

In 2006, Mark added Professional Cylinder inspectors (PCI) as an all encompassing entity for cylinder inspection training outside the scuba industry, now providing training for the beverage, aviation, medical and other areas where high pressure cylinders are utilized. He is instrumental in raising awareness among dive industry constituents for the merits of cylinder safety and visual inspection. He provides the most comprehensive, up to date and specialized federally required Hazardous Materials (HAZMAT) training to all segments of the dive industry. 

The most direct measure of Mark’s influence and success toward the reduction in pressurized gas accidents is that for the first time in more than 40 years NO cylinder ruptures were reported in 2015.  Mark has led that PSI-PCI goal for more than 10 years. There is no doubt that lives have been saved and certainly injuries prevented by Mark Gresham’s dedication to high pressure cylinder safety training broadly offered in the world today.  

Mark founded Professional Cylinder Consulting as a focus to provide expertise and consulting to those needing assistance with cylinder issues, accidents or education.   He looks forward to assisting you.