Executive Leadership

Flash Global's Executive Leadership Team has the vision, passion and expertise of end-to end service supply chains needed to forge innovative solutions that keep the world connected.

Sam Mikles

Chief Executive Officer Having most recently served as the Chief Operating Officer for Flash Global, Sam Mikles brings over 17 years of senior leadership experience Read More

Gregory Castello

Chief Financial Officer Greg Castello brings over 20 years of experience in financial and management roles within high growth and innovative organizations to Flash. Read More

John T. Miller

Chief Sales Officer John Miller joined Flash in 2008. He is responsible for sales, marketing, and client development for Flash on a global basis. Read More

Matthew J. Zimmer

Chief Operating Officer Matt Zimmer brings to Flash and our customers a strong blend of supply chain, operations and business acumen. In his leadership roles within a variety of Fortune 500 companies Matt has successfully optimized customers across Read More

Denise MacDonell

Chief Technology Officer Denise MacDonell, an expert in change management with a proven track record of shaping software applications to drive value-added services to customers, took over as Chief Technology Officer in 2016. Read More

Sam Mikles Chief Executive Officer

Having most recently served as the Chief Operating Officer for Flash Global, Sam Mikles brings over 17 years of senior leadership experience in the service supply chain industry. Sam has dedicated his career to serve the customer, having architected and built global service & support organizations for some of the worlds most recognized OEM‘s in the high-tech space. Under his leadership at Hitachi Data Systems, Blue Coat Systems, and EMC, Sam was able to design, build, and implement global leading-edge service & support solutions that provided superior performance that directly contributed to revenue acceleration, profitability growth and ultimate customer satisfaction. With an extreme focus on process automation, data analytics, performance management, quality execution, and building high-performing teams, Sam is taking Flash to a higher level of global operational excellence to create consistency, predictability and visibility in all that we do.

“It’s all about serving the customer, ensuring their business requirements are being met with extreme conviction and a controlled sense of urgency. I know what it’s like to be in the front-line seeking service-delivery nirvana, anywhere, anytime in some of the most challenging countries in the world…I was the customer, just like you. It’s our job to make each of our customers a hero without anyone ever knowing our name. Seamless operations with outstanding operational performance, wrapping ourselves around every customer to create consistency, predictability and visibility in all that we do. I want customers to be proud of their partnership with Flash as a true extension of their own team. I am extremely passionate about leading our transformation from a traditional 3PL to a service supply chain partner that is innovating and delivering value for you and your customers.”– Sam Mikles

Gregory Castello Chief Financial Officer

Greg Castello brings over 20 years of experience in financial and management roles within high growth and innovative organizations to Flash. Greg’s financial stewardship is guided by his success for a variety of private equity backed and public companies in both domestic and international business environments. Greg’s leadership has engineered several M&A transactions as well as compliance efforts and revenue generation. Certified as a CPA, he also draws on tenure as CFO Zephyr Communications Inc., and Vaultus Mobile Technologies Inc. Greg’s responsibilities have included all aspects of accounting, finance and operations.

“Being forward-focused is the greatest asset that Flash offers our customers. This company is never content to simply address the market where it currently stands. Rather than respond to demand, we predict needs and opportunities in advance. The team at Flash watches for global trends and proactively leverages them. For our clients, that means we’re ready when they’re ready. Lots of companies claim to be visionary. At Flash, we strive to be pacesetters. Working with an authority in the supply chain industry frees our clients to focus exclusively on building their business without worrying about the logistics.”– Greg Castello

John T. Miller Chief Sales Officer

John Miller joined Flash in 2008. He is responsible for sales, marketing, and client development on a global basis. He is a dynamic leader who leverages 20-plus years of critical logistics supply chain expertise to forge successful business development initiatives that increase revenue, market share, and account penetration in domestic and global high-tech markets. John’s proven track record in client account development and his in-depth understanding of client-specific requirements is geared toward the critical parts space and driving opportunities for expansion within that space. Prior to joining Flash, John spent 14 years at Choice Logistics, where his progressive leadership of the sales and marketing teams placed him in senior executive roles — including Senior Vice President of Business Development. John also spent two years with Sonic Air earlier in his career. John’s documented success in client account development and in-depth understanding of client-specific requirements is geared toward the critical parts space and driving opportunities for expansion within that space.

“‘Right Part, Right Place, Right Time’ was the foundation for the service parts logistics industry when I first began my career 23 years ago. These fundamental principles still apply. However, the scope of business that now includes global expertise and optimized software solutions has moved global logistics leaders like Flash Global to the forefront of high tech global service initiatives and solutions. Flash Global will continue to invest in technology and resources to develop leading edge solutions for our clients on a global basis. Our vision is endless and our mission is critical to the success of our clients.”– John Miller

Matthew J. Zimmer Chief Operating Officer

Matt Zimmer brings to Flash and our customers a strong blend of supply chain, operations and business acumen. In his leadership roles within a variety of Fortune 500 companies Matt has successfully optimized customers across a multitude of verticals including data storage, networking, telecom, consumer electronics, automotive, and medical. During his years at Flextronics, Matt held several high growth positions at the Director, General Manager, and VP levels. He consistently grew revenue, optimized operations, and built high-performing teams, while decreasing operational investments and managing full P/L responsibility. Prior to Flextronics Matt served in several key positions at Pinnacle Data Systems, where he grew revenue, expansion of the global footprint, and achieved significant annual costs savings. At Flash Matt leverages this expertise to lead our Customer Solutions team in providing best-in-class services that optimizes our customer’s most demanding service supply chain solutions. He is focused on leading customers to achieve significant revenue growth, proactively enhance customer engagement, and optimize our services to meet your business objectives.

Building world class teams to efficiently and effectively help grow our customer’s brand awareness with global reach is one of my top priorities. Allowing our customers to focus on their technology and intellectual property is critical, while Flash drives ownership and accountability to seamlessly position our customer’s products in all regions around the world to meet the strictest standards in terms of service delivery and performance. We must have a relentless pursuit of recruiting, developing, and mentoring talent within Flash to continuously drive value and global expansion for all our business partners as a true extension of their teams. Our responsibility is to take back-of-the-napkin ideas or intense solution design and turn them into global strategies that bleed execution.

Denise MacDonell Chief Technology Officer

Denise MacDonell, an expert in change management with a proven track record of shaping software applications to drive value-added services to customers, took over as Chief Technology Officer in 2016. Denise’s strategies, vision and ability to leverage technology and people to create a collaborative, efficient environment that always puts the customer first — after all, Flash is in the services business —is crucial to our success. Throughout her 15-year career, Denise has led and worked in turnaround and startup efforts with small, midsize and Fortune 100 companies. As vice president of Product Management for This Technology, Denise led the company’s transformation from an engineering-driven organization into one driven by product and software innovation. That successful evolution led Comcast Corporation to acquire This Technology in 2015 and Denise was appointed VP of Advertising Software, a role she held until coming to Flash.

What we’re doing from a technology standpoint isn’t about building and maintaining a traditional supply chain where things are handed off from one stage to the next. We’re creating an ecosystem that meshes products and services into seamless solutions. Technology is that mesh.— Denise MacDonell