Devon Grennan


Mr. Grennan joined Global in 1995 and grew up in the business by serving in a variety of roles including Marine Environmental Supervisor, Environmental Manager and General Manager. He was appointed President in 2009 and added the title of Chief Executive Officer in 2013. With the new ownership group, he remains President, and serves on MER’s Executive Committee. Mr. Grennan’s primary role is to implement Global’s strategic plan, including development of partners along the West Coast and abroad, and the expansion and growth of Global’s core strategic service lines. His passion is looking for ways to introduce younger generations to the maritime industry, and he is proud to continue his family’s history of working on the water. He holds a Bachelor of Arts degree from the University of Washington, and is an active member of Vistage.

Industry Associations:
Spill Control Association of America, Past President
American Salvage Association, Executive Committee
Vistage, Seattle
Propeller Club

Dan Pierson

VP of Operations

Mr. Pierson began diving for Global in 1992, working as a diver/tender, saturation diver, Dive Supervisor and Dive Superintendant before moving into management roles, first as Asset Manager, then Vice President of the Pacific Northwest Region. He was appointed Vice President of Operations in 2014, and is responsible for overseeing all of Global’s regional offices as well as corporate asset management. Mr. Pierson earned his commercial diving certificate from the Divers Institute of Technology in 1991 and honed his skills working in the Gulf of Mexico.  He grew up on the water and has been involved with recreational boating and diving all of his life, and it continues to be a passion of his today.  Mr. Pierson says although he never wanted to grow up and take an office job (“You miss one meeting and your future is planned for you…”), he feels very fortunate to have worked with so many incredible people over the years, both in the field and in the office. “Global has come a long way during my time here, and I’m excited to see where we take it next.”

Industry Associations:
Association of Diving Contractors, Inc., Board of Directors
International Marine Contractors Association
Divers Institute of Technology, Program Advisory Committee Member
The Beavers

Mike Langen

VP of Marine Construction, Engineering, & Technology

Mr. Langen has over 30 years of experience in the industry as a diver, engineer and manager. After several years working as a commercial diver he returned to school and earned a Bachelors of Science in Ocean Engineering from the University of Washington. After graduating, Mr. Langen worked as a design engineer and project manager developing ROVs and other underwater systems and tools. In 1998, Mr. Langen rejoined Global Diving & Salvage, Inc. to organize and market the company’s growing inland marine construction business, developing it into a competitive and nationally sought after business line. As Vice President of Marine Construction, Engineering and Technology, Mr. Langen is responsible for project management, engineering support, bid evaluations, cost estimating and field operations of the marine construction service line, as well as operation of the ROV Division. He also oversees a full time support services group focusing on in-house engineering and design.

Industry Associations:
The Beavers

Jennifer Jensen

VP of Human Resources

Ms. Jensen joined Global in 2013 and is the head of Human Resources (HR), Contracts, and Professional Development. She ensures these groups are responsive to the needs of our clients, our operations and our employees. Ms. Jensen holds a BA in Business Administration from Eastern Michigan University; she also holds SHRM-CP and PHR certifications. Prior to working at Global, she gained experience in the airline, higher education and retail industries, holding a number of management positions including Director of Human Resources.

Industry Associations:
Society for Human Resource Management
Association for Talent Development
The Risk Management Society
Lake Washington Human Resources Association
World At Work

Eric Rose

Director of Business Development

Mr. Rose joined Global in 2017 as Director of Business Development, responsible for Global’s long-term revenue generation, marketing, and the support of Global’s regions and service lines.  Prior to working at Global, he spent 12 years managing heavy construction equipment sales for Caterpillar, Inc. and Weiler Products, where he was responsible for sales, product development and dealer development. Mr. Rose holds a BA from the University of Montana where he majored in Business Administration and Marketing. A Seattle native, he spends his free time with his wife and kids exploring the great PNW.

Industry Associations:  
American Salvage Association
The Beavers
International Salvage Union
Propeller Club
Spill Control Association of America (SCAA)

Kyle Watson

Director of Casualty Response

Mr. Watson has more than 20 years of experience in the maritime industry. He holds a Business Administration degree from the California Maritime Academy, and served as a lieutenant for the US Coast Guard Reserve in San Francisco before joining Global in 2003. Mr. Watson has held several positions in Global’s Seattle and San Francisco offices, including Environmental Operations Manager and Salvage Officer, and has worked on many of Global’s highest profile casualty response projects. Mr. Watson is responsible for all of Global’s emergency services, including salvage, wreck removal, and emergency response operations.

Industry Associations:
Spill Control Association of America

Deirdre Gross General Manager

Deirdre Coots

Alaska Region General Manager

Ms. Coots has been in the commercial diving industry for more than 10 years. After attending the University of Alaska at Fairbanks, she began working as Office Manager for Offshore Divers in Anchorage in 2007. Global acquired Offshore Divers in 2009 and Ms. Coots became Global’s Alaska Region General Manager in 2011. Ms. Coots is responsible for all aspects of the region’s daily operations including estimating, administration and budgeting. Her knowledge of Alaska’s businesses and industries have helped foster Global’s business development in the region. Ms. Coots acknowledges that she is terrified of heights and prefers to be close to the water, if not in it; she says she would have loved to go to dive school.

Industry Associations:
Petroleum Club of Anchorage, Vice President
Women’s International Shipping & Trade Association

Chad Kasin

California Region General Manager

Mr. Kasin has a long career in the marine industry, starting out as a diver in the US Navy. He began working at Global as a saturation diver and superintendent in 2007, becoming Dive Operations Manager of the Northern CA branch in 2014 and General Manager in 2019. He oversees both California offices, managing the field and administrative groups, and is responsible for the region’s marine construction estimates, budgeting, scheduling, and objectives.

Alex Hess

Pacific Northwest Business Manager

Mr. Hess started his career working in the field as a diver; in 2009 he came to Global as Assistant Dive Operations Manager, moving up to Environmental Operations Manager and most recently Dive Operations Manager, coordinating field operations and project management. In 2020 he became Pacific Northwest Business Manager, where he is responsible for the leadership, operations and administrative details of the PNW regional office, including the focused growth within our core strategic lines.

Industry Associations:
Seattle Propeller Club
Piledrivers Joint Apprenticeship Training Committee



Ryan Cummings

Asset Group Manager

Mr. Cummings has been involved in the commercial diving industry since 1996 when he graduated from Santa Barbara City College with a degree in Marine Technology. He started at Global in 2003 as a diver and ROV Pilot, working on many of the company’s high-profile ROV salvage and construction projects. In 2012, Mr. Cummings became Global’s Assets Group Manager, where he is responsible for the company-wide purchasing, maintenance and transportation of all the company’s assets. He manages all diving equipment, vessels, vehicles, tools and other equipment.

Business Development & Marketing

Frank Immel

Business Development Account Executive

Tony Carter

Business Development Account Executive

Lara Mayer

Marketing Communications Coordinator

Marine Construction

Renee Gowdy Estimating Group Manager

Renee Gowdy

Construction Group Manager

Lee Brockmoller

Chief Estimator

Abraham Rodriguez

Project Engineer

Andy Wheeler

Project Engineer

Spencer Smith

Field Engineer / Estimator

Dive Operations

Bernie Rosenberger

Dive Operations Manager – Alaska

Bill Akan

Dive Operations Manager – SE Alaska

Jim Greene

Dive Operations Manager – Southern California

Fred Foster

Dive Operations Manager – Northern California

Spencer McGinnis

Health, Safety & Environmental Program Manager

Marine Casualty

Kerry Walsh Project Manager

Kerry Walsh

Project Manager & Salvage Master

Kristofer Lindberg

Salvage Master

Katy Stewart

Salvage Officer

Environmental Services

Thuan Ngo

Environmental Operations Manager – Pacific Northwest