Josh co-founded Sentinel Data Centers in 2001, initially acquiring and repositioning dotcom-era data centers and ultimately building a fully integrated builder, owner and operator. Josh has since overseen the successful delivery and operation of each of Sentinel’s campus and customer fit-outs, working collaboratively with many of the industry’s most demanding end users. In 2017, Josh integrated Sentinel and www.Rabina.com into a joint organization, deepening both firms’ pool of shared development resources and facilitating a new phase of growth for Sentinel. Josh continues to lead the day-to-day activities of the integrated firm that is collectively executing over $5 billion of ongoing or near-term development.

Mike is a veteran construction leader, deeply experienced in building best-in-class execution teams and complex mission critical construction.  Mike is based in Virginia and overseas Sentinel’s Mid-Atlantic construction activities. Prior to joining Sentinel, Mike spent 20+ years at AECOM Tishman, providing dynamic leadership across a range of challenging construction environments. Mike has an MS in Business Administration and a BS in Industrial & Systems Engineering from Virginia Tech.

Nick is a passionate and energetic engineering leader, deeply experienced in collaborating with Sentinel’s customers to design and deliver custom-fit data center solutions from conception to commissioning.  Nick received a BE and ME from Stevens Institute of Technology and had more than a decade of experience in complex engineering and project management for a multitude of best-in-class data center clients prior to joining Sentinel.

Kaleb Maddox (CDCTP /CDCMP) is a deeply experienced operational leader with responsibility for the oversight of Sentinel’s facility operations for the NE Region. Prior to Sentinel, Kaleb served nine years in the Navy involved in the critical operations of a nuclear-powered submarine, in which he had a primary focus on electrical systems. During time spent in the navy Kaleb pre-commissioned the Indiana, the newest Virginia class submarine, was a selected instructor for the naval nuclear power pipeline and qualified as a diver to support critical operations for the fleet. 

Bryan serves as CFO and COO of Sentinel Data Centers, leading the financial and operational infrastructure that supports growth, including finance, asset management, HR, and IT. He also partners closely with the investment and development teams to execute and integrate new investments. Bryan brings more than 30 years of experience in finance, M&A, and capital markets, including leadership roles in multiple IPOs within the data center sector. He earned an MBA from the UCLA Anderson School of Management and a bachelor’s degree from Boston College. He is also a CPA licensed in New York and Massachusetts.

Pedro is a thoughtful and experienced development and construction leader, having fully managed all elements of permitting and construction on multiple Sentinel projects from inception to commissioning.  Prior to Sentinel, Pedro worked at both Turner Construction and at a private developer, overseeing complex construction in the life-science, mixed-use and mission-critical spaces. Pedro holds degrees in Economics and Civil Engineering from the University of Virginia and a Master’s in Real Estate Development from Columbia University.

Sam Nidenberg is a deeply skilled investment and financial professional, focused on acquisitions, joint ventures, analytically-intensive asset management functions and capital market activities across the entire Sentinel/Rabina platform.  Prior to joining Rabina, Sam held multiple acquisitions, financial and capital markets positions at JLL and another NY-based developer. Sam earned a BA in Economics and Mathematics from Hamilton College.

Alan is a Senior Associate on the Investments team, managing day-to-day activities with respect to acquisitions, capital-markets executions, and analytically-intensive asset management across the Sentinel/Rabina platform. Alan also spearheads site sourcing, entitlement and due-diligence efforts for Sentinel. Alan holds a BA in Computer Science and Cognitive Science from the University of Pennsylvania.

Mike is a veteran accounting and compliance leader. Mike and his team support all of the accounting needs across the entire Sentinel/Rabina platform’s development and operations activities, including financial statement preparation, budgeting, financing, and accounts payable and receivable. Mike has been integral to the platform for over 20 years, handling a wide array of complex transactions, domestically and internationally and providing critical support in the growth of the firm’s multiple development endeavors.

Tim is an experienced, skilled and diligent accounting leader, responsible for directing the accounting, tax, and financial reporting activities across the Sentinel/Rabina platform.  Tim began his career in public accounting/audit and was a Senior Associate at Marcum LLP focused on real estate. Tim received his Master of Professional Accountancy and Bachelor of Sciences in Business Administration with a concentration in Accounting from Bryant University. He is a Certified Public Accountant.

Ryan is dedicated to assuring rapid and high quality reporting and requisitioning with respect to Sentinel’s development projects, overseeing cost management, reporting and financial compliance with respect to Sentinel’s data center construction activities. Ryan has over nine years of experience in mission critical finance and accounting, having most recently worked for Stack Infrastructure in Manassas VA on multiple hyperscale data center development projects. Ryan holds a BA in finance and accounting from Univ. Maryland.

Frank Costantini, RA, is a licensed architect in New Jersey and New York with over a decade of experience delivering complex industrial, commercial, and mission-critical projects. His expertise spans data centers, logistics facilities, warehouse developments, and large-scale site planning. Combining architectural leadership with project management experience, Frank guides projects through planning, permitting, design, and construction while coordinating multidisciplinary teams and regulatory approvals. He is committed to practical, client-focused solutions that balance technical excellence with project objectives.

Frank supports the Sentinel project team in planning, coordinating, and executing all phases of data center development projects, from pre-construction through commissioning, ensuring scope, schedule, and budget alignment.

With years of hands-on experience in the electrical industry, Mohamad Abdallah is dedicated to providing safe, reliable, and high-quality electrical solutions for every customer. Specializing in general and commercial electrical work, Mohamad is skilled in electrical installations, troubleshooting, repairs, and code compliance, with a strong commitment to safety and quality workmanship. He is known for delivering reliable solutions, exceptional service and completing projects efficiently and on schedule. When not at work, Mohamad enjoys spending time with his family and grandchildren. 

Kevin is a deeply experienced mission-critical technical leader with a full spectrum of experience in construction, commissioning and operations. Kevin is responsible for oversite of various complex MEP workstreams, often leading trade field activities and coordinating final QA/QC punchlisiting and commissioning activities through handoff to operations. Kevin has over 15 years of experience in the mission critical space having previously worked as a mission-critical MEP Project Manager at DPR Construction and prior to that at firms including JLL, CBRE, Clune Construction, and Digital Realty Trust.

Cristian is a resourceful and experienced data center construction leader, known for approaching complex mission-critical builds from unconventional angles to keep multi-billion-dollar projects moving toward a timely and successful completion. At Sentinel, Cristian is responsible for leading the development of projects in various new markets. Previously, he managed an 11-shell campus buildout for AWS in NoVA, while earlier in his career, he held construction leadership positions at Clark Construction, Rosendin Electric, and Lidl US&RO, where he repeatedly found creative paths through design, permitting, and construction challenges to hand over finished data centers, distribution centers, and retail spaces across the US and Europe. Cristian holds a Master of Architecture from the University of Architecture and Urban Planning “Ion Mincu” in Bucharest, Romania.

Antanique Merritt is a strategic procurement leader delivering multimillion-dollar sourcing initiatives for large-scale data center programs. She currently leads OFE procurement efforts at Sentinel, supporting mission-critical infrastructure projects. Prior to joining Sentinel, Antanique supported global data center portfolios for hyperscale clients, such as Microsoft and Meta, driving supplier performance improvements, cost optimization, and faster procurement cycles. She holds a Bachelor of Arts in Public Relations from Temple University.

Buster is an experienced, skilled and customer-oriented operations leader with a deep technical and team-building skill set. Buster oversees site-specific services for Sentinel’s operations team. Prior to Sentinel, Buster was a Nuclear Electronics Technician Supervisor and Military Veteran with 20 years of experience in the U.S. Navy, having been promoted through progressive levels of technical, leadership, and managerial experience in nuclear plant operation and maintenance.

Roger is a seasoned, skilled and customer-oriented operations leader with site-level oversight responsibilities for all aspects of data center operations, strategic planning, and team leadership. Roger has over 16 years of experience, including seven years at Sentinel and nine years in the U.S. Navy as a submarine electronics technician. He holds a universal EPA 608 certification, is a Certified Data Center Management Professional (CDCMP), and earned his MBA with a specialization in Finance.

Jason is a deeply skilled and talented data center engineer with over 20 years of experience in data center operations in Seattle, Iowa and Virginia. Jason has been with Sentinel for 6+ years and is a critical contributor within the operations team.

Will is a seasoned critical environment engineer. He got his start in the U.S. Navy as a submarine Reactor Operator and transitioned shortly after to the data center world. He puts a focus on integrity, thoroughness, and team building as keys to long term operational success. Will loves to read science fiction and build computers in his downtime.

Michael is a highly technical and diligent operations engineer, having helped oversee operations at multiple Sentinel facilities over the last 5+ years. Previously, Michael served six years with the U.S. Navy Nuclear Power Program, with a focus on quality assurance and maintenance programs. He also has over five years’ experience as a Rotary Uninterruptible Power Supply Technician, specializing in the installation, maintenance, and repair of rotary UPS systems.

Chris has 12+ years of experience working in critical environments, and prior to that spent several years working on electrical crews in West Virginia, Maryland and North Carolina. Chris has been with Sentinel for over 5 years supporting facility operations.  He strives for excellence and has an active interest in encouraging growth and expertise among his teammates, while working to achieve the highest satisfaction levels from clients.  In his free time, Chris like to golf, fish, and of course spend time with his Olde English Bulldog Henry!

Wilbur spent 11 years as a U.S. Navy mechanic learning how to fix complex equipment under pressure before transitioning into tech infrastructure. For the last 15 years, he has worked in data centers, ensuring the massive systems powering our everyday digital world run flawlessly. As Assistant Chief Engineer, Wilbur keeps the facility running like clockwork, handles tough technical upgrades, and mentors the newer technicians on the team. For him, the job is simple: keep the machines happy, support the crew, and build a team that actually enjoys working together.

Paul oversaw operations at Sentinel’s managed data centers for  over 10 years, owning all operational elements from construction handoff and commissioning to customer care. Currently, Paul is partially-retired and works part-time to provide guidance and strategic oversight to Sentinel’s site and regional level operational leadership. Prior to joining Sentinel in 2009, Paul was the Managing Director and VP in charge of all critical facility operations and engineering for the NYSE, overseeing the entire NYSE critical facilities portfolio.  Paul has a MS in Management of Technology from the NYU Polytechnic School of Engineering and a BS in Mechanical Engineering from the New York Institute of Technology.

Jaclyn has been a core member of the Sentinel platform for more than eight years, leading critical HR and administrative functions while partnering closely with site administrative teams to deliver consistent, high-quality support across the portfolio.

Daniella is a core member of the Sentinel team, overseeing all administrative functions for the NE region.