A Locally Managed, 100% US Company

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Roland Certeza, President and Chief Executive Officer of GTA. Certeza has been instrumental in the company’s strategic initiatives innovating GTA for the past 20 years. As a results-proven leader, he has led the way to GTA’s globalized investments in the undersea cable industry, grown GTA’s retail footprint, transformed GTA’s portfolio and ignited a vision for the future of GTA.

As a telecom veteran, Certeza infuses a new dynamic culture to Guam’s telecom industry with his experience working with the world’s most renowned companies such as Apple, Verizon, Sprint and Deloitte. His extensive expertise in Sales & Marketing has ignited creativity and innovation in the telecom industry on the island.

Certeza holds a B.S. in Business Administration-Accounting from San Diego State University and is a proud Alumni of the University of Guam where he obtained his MBA. He is also an active member of the Island Sustainability Community Advisory Board created to shape and cultivate a sustainable future for our region.

While Certeza devotes his time to GTA and its growth, he enjoys his time with his wife Amy and his passion for surfing. Certeza is the son of Gerry and Lina Certeza.

Joseph Shinohara is the Chief Financial Officer of GTA. He joined the company in 2007 and has held a series of senior leadership roles, including Finance Director, Vice President of Finance/Controller, and Executive Vice President of Finance, before being appointed Chief Financial Officer by GTA’s Board of Directors in July 2018. He also serves as the company’s Corporate Secretary.

With nearly two decades of experience at GTA, Shinohara is responsible for the company’s financial strategy and day-to-day financial operations and plays a key role in shaping long-term strategic growth, enterprise digital transformation, and disciplined capital investment. He has been instrumental in major corporate initiatives, including multiple ownership transitions, capital-raising initiatives, strategic investments, and financing activities, contributing to an improved credit profile and a strengthened financial position for the company.

Shinohara is a licensed Certified Public Accountant (CPA) and Chartered Global Management Accountant (CGMA) and a former auditor with Ernst & Young. He is an active member of the American Institute of Certified Public Accountants and the Guam Society of Certified Public Accountants and serves on the Parish Finance Council of the Dulce Maria Cathedral-Basilica. He holds a Bachelor of Business Administration with a double major in Management and Accounting from the University of Guam.

Shinohara resides on Guam with his wife, Angelica, and their family.

Andrew Gayle serves as Chief Operating Officer of GTA, Guam’s oldest telecommunications company, which has provided services to the island for more than 75 years. He brings over 35 years of diversified experience in telecommunications and information technology.

Mr. Gayle joined GTA in 2005 following its privatization and has since held a succession of senior leadership roles across both sales and operations. Under his leadership, GTA transformed from a traditional telephone service provider into a fully integrated telecommunications company, becoming the first on Guam to offer a complete suite of services including wireline, wireless, internet, and digital television.

He has led several landmark initiatives, including the build-out and operation of GTA’s cellular network, the development of the company’s smartphone strategy, and the expansion of next-generation broadband infrastructure across Guam. These efforts include GTA’s participation in federally supported broadband deployment programs, such as the USDA ReConnect grant and a Broadband Equity, Access, and Deployment (BEAD) subgrant, focused on extending high-speed, reliable fiber-based broadband to unserved and underserved communities on the island.

Born and raised in Guam, Mr. Gayle continues to reside on the island with his wife and three children. His civic involvement includes serving as Chairman of the Guam Solid Waste Authority and long-standing volunteer service as a MATHCOUNTS moderator. He holds a degree in Computer, Electrical, and Systems Engineering from Harvard University. Outside of work, he enjoys golfing and serves as Handicap Chairman of the Nunu Golf Club.

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Jon Nathan “Nate” Denight serves as the Senior Vice President of Marketing and Consumer Sales at GTA, where he leads the strategic direction of the company’s marketing, brand, and product initiatives. Since joining GTA in August 2021, Nate has brought over two decades of marketing expertise, with a strong background in brand development, creative execution, and experiential engagement. He plays a key role in aligning marketing and product strategies to support GTA’s business goals and drive innovation across the organization.

Born and raised on Guam, Nate previously served as Vice President, then President and CEO of the Guam Visitors Bureau from 2011 to 2019. During his tenure, he co-authored the Guam Tourism 2020 Plan and was instrumental in elevating the island’s global reputation as a premier travel destination.

Nate continues to give back to the community through board service. He currently sits on the boards of the Make-A-Wish Guam and CNMI and Para i Probechu'n i Taotao-Ta, Inc. , contributing his leadership and vision to efforts that support children facing critical illnesses and enhance CHamoru culture.

He is the recipient of the 2017 Reina A. Leddy Guam Young Professional of the Year Award, presented by the Guam Chamber of Commerce in recognition of his leadership and impact.

Nate holds a bachelor’s degree in commerce from Santa Clara University. Outside of work, he enjoys traveling, sports, and most of all, spending time at home in Guam with his wife Lana and their daughter Luna.

Sharon Davis is a strategic and passionate leader whose impact has shaped GTA’s customer and community engagement efforts for nearly two decades. As Senior Vice President of Community Engagement and External Affairs, she leads GTA’s philanthropic initiatives through GTA Gives, builds impactful partnerships, and drives programs that uplift and strengthen communities across Guam.

Since joining GTA in 2006 as an Account Manager in Enterprise Sales, Sharon has risen through the organization—serving as Director of Client Services and later as Vice President of Customer Experience, where she led a dynamic team of “ROCKSTARS” focused on delivering exceptional service. She is Lean Six Sigma Green Belt certified and known for her ability to streamline operations while keeping the customer at the center of every decision.

Sharon holds a degree from the University of Nebraska – Omaha and is a dedicated community advocate. She currently serves as Chairwoman of the Guam Memorial Hospital Board of Trustees, Chair of the Junior Achievement of Guam Board, and is a member of the USO Guam Advisory Council. She also mentors GTA’s Junior Achievement Company of the Year student team—empowering youth through financial literacy, entrepreneurship, and career readiness.

Sharon’s leadership reflects a deep belief in service, mentorship, and creating meaningful impact through connection and community.

Carl Leon Guerrero serves as the Senior Vice President of Operations at GTA, bringing three decades of telecommunications expertise to the company. In this role, he leads operational strategy, capital improvement initiatives, and the implementation of cost-effective systems to meet the company’s current and future infrastructure needs.

Carl began his career as Chief Engineer with the former government-run Guam Telephone Authority and has played a pivotal role in shaping Guam’s telecommunications landscape. His career highlights include the successful conversion of Guam to Feature Group D Equal Access, integration into the North American Numbering Plan, the installation of fiber core and distribution networks across the island, and the full transformation of GTA’s wireless network from analog to digital.

A proud graduate of Father Dueñas Memorial High School, Carl earned his Bachelor of Science in Electrical Engineering from the University of Portland. He is also a certified Professional Electrical Engineer with the Guam Professional Engineer, Architects, and Land Surveyor (PEALS) Board.

Andy LaBrunda serves as the Senior Vice President of Data Centers at GTA, where he leads the company’s strategic vision for data center growth, digital infrastructure, and future-ready IP services. Since joining GTA in 2005, Andy has played a key role in advancing the island’s digital capabilities through technology innovation and large-scale network development.

He began his GTA career as a project manager overseeing the launch of the wireless GSM network and has since held multiple leadership roles, including Vice President of IT and IP & Video Headend. Andy spearheaded critical projects such as the deployment of an ArcGIS platform to support network expansion, major postpaid billing system conversions, and the modernization of digital TV services through next-generation IP infrastructure.

In 2015, he led more than 250 employees across engineering and construction in the launch of GTA’s Fiber to the Neighborhood initiative, delivering higher internet speeds through the installation of 250 miles of fiber and service to over 350 neighborhoods.

Prior to GTA, Andy taught computer science at the University of Guam. He remains passionate about growing Guam’s tech ecosystem and serves on the board of the Code Foundation, a nonprofit dedicated to building local technical talent and resources. He is also a frequent presenter in local tech forums such as the Guam Hacktober Festival, where he has showcased the practical applications of Raspberry Pi.

Andy is a proud graduate of Simon Sanchez High School. In his free time, he enjoys kitesurfing, snorkeling, and exploring the natural beauty of Guam’s coastlines.

Jason Katigbak joined GTA in November 2024, serving as Vice President of Finance. He has over 20 years of combined assurance, accounting, project management, IT, and finance experience. Prior to joining GTA, he held senior financial leadership positions including Director of Business Optimization, Chief Financial Officer and Chief Accounting Officer at IP&E Holdings, LLC and Citadel Pacific. Jason also served as a Senior Manager at Ernst & Young, where he led audit teams specializing in various industries such as telecommunications, oil and gas, and governmental auditing, contributing to the enhancement of the firm’s audit quality and training programs.

In addition to his professional roles, Jason is an Adjunct Instructor at the University of Guam and Chaminade University, teaching accounting courses at both undergraduate and graduate levels.

He holds a Doctoral Degree from Bellevue University, an MBA from Delta State University, and an undergraduate degree in accounting and commerce from Colegio de San Juan de Letran - Calamba. Jason is a Certified Public Accountant (CPA), Certified Internal Auditor (CIA), Certified Fraud Examiner (CFE), and Chartered Global Management Accountant (CGMA). He has served as a past president of the Guam Society of Certified Public Accountants, the Association of Government Accountants Guam Chapter, and as a board member and Treasurer for Junior Achievement of Guam.

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Cora Yanger Bejado brings over 25 years of experience in Guam’s telecommunications industry and currently serves as Senior Director of People Operations at GTA.

As head of People Operations, Cora oversees talent, employee experience, policy and compliance, compensation and benefits, learning and development, and employee relations. She leads strategic HR initiatives that align people and culture with business goals, bridging strategy and execution while using data-driven insights to strengthen the employee lifecycle and organizational performance.

Prior to her current role, Cora held senior leadership positions at GTA, including Retail Director, Marketing Director, CX Operations Director, and Process Improvement Director.

She is a graduate of the University of Guam and Notre Dame High School and is actively involved in the community through SHRM, Guam Workforce Development, Guam Unique Merchandise & Arts, and the Guam Council on the Arts & Humanities, and previously served as Islandwide Chair and Regional Board Member of the American Cancer Society.

Cora also enjoys time with her large family, making jewelry, and traveling.