CompleteSpectrum is an interaction management agency — more than marketing campaigns, we create brand engagement strategies that drive revenue growth and build customer loyalty.

Specializing in the private equity space, we partner with private equity funds and privately owned high-growth companies to develop brand stories, package them in a compelling manner, and deliver them to their target audiences. Wherever you may be in the lifecycle of your business, we offer a complete spectrum of marketing services tailored to your specific business objectives.

Our Pillars of Support


Strategic Expertise

Rooted In Our Brand
Marketing Heritage

Creative Ingenuity

Powered by Data-Driven Insights

360˚ Intelligence

That Is Measurable & Actionable

Integrated Technology

Enabling Omnichannel Interaction

Dedicated Focus in Private Equity

Honed Over 10 Years Of Driving Revenue Growth For Private Equity-Backed Companies

Meet the Executives

Phillip McMillan

Founder & CEO

Phillip is the CEO & Founder of CompleteSpectrum. As CEO, he is responsible for strategy development, key client management, and finance. Prior to serving as leader of the CompleteSpectrum team, Phillip worked as an independent consultant, driving operations, sales, and international business development strategies. With over 20 years of experience in sales and marketing strategy development, Phillip has spent the last 10 years focused on private equity portfolio companies and helping them through acquisition integration, growth marketing, and exit communications to maximize value and provide scalable execution through the hold. He is frequently called upon by CEOs and operating partners to evaluate and recommend branding plans for complex buy-and-build strategies. His experience spans B2B and B2C audiences in multiple verticals, including industrial, retail, technology, and healthcare.

Matt Stein

Executive Vice President

Matt serves as Executive Vice President and Chief Marketing Officer at CompleteSpectrum. With nearly 20 years of marketing experience in executive leadership roles, he drives revenue-generating solutions that span the online, mobile, social, print, local and broadcast media channels, as well as the full customer journey from initial awareness to ongoing loyalty engagement. Prior to joining CompleteSpectrum, Matt held leadership positions at PEAK6, a private equity investment firm; Kobie Marketing, a leading loyalty marketing agency; Catalina Marketing, a data-driven direct marketing firm; and Wunderman, a global digital agency and member of the WPP Group. Matt is an alumnus of The University of Cincinnati where he received his degree in marketing & digital media. He currently lives in Tampa, Florida with his daughter.

The Complete Process



The best brand and marketing strategies come from true partnership and collaboration – within your organization and between our team and yours. Our CoMarket & CoCreate process is built to streamline the development of your strategic marketing plans, gaining input & insight from across your company quickly and efficiently, and ensuring alignment between your key leadership & stakeholder teams.

Work With Our Team

CompleteSpectrum is all about providing our team members with the best working experience - from our flexible time off policy to our generous health insurance provisions, we take care of our team so they can take care of our clients. We currently have the following job openings:

  • Continental United States: Search Engine Marketing (SEM) Manager (learn more)
  To apply for an open position, please submit a cover letter and resume to