Mark Callaghan co-founded PhotoDisco, a Seattle-based stock image publisher that later became part of digital images provider Getty Images. He has been Partner at Cedar Grove Investments and Director of Acquisitions and Development at McCaw Cellular. He was part of the team that built the McCaw Cellular Network nationwide through the acquisition of licenses. Callaghan left McCaw in 1988 to co-found Capital Cellular and later Columbia Cellular in Washington DC. He managed the construction and launch of the first nationwide cellular network in Columbia. He is also the co-founder and CEO of Blue Sky Cleaners, a toxin-free dry-cleaning company in Seattle.