Our Leadership


Ken Michaels

Ken Michaels

Chief Executive Officer

Before becoming Macmillan Learning's CEO, Ken was responsible for leading global operations for Macmillan Science and Education. He previously served as President and Chief Operating Officer at Hachette Book Group, spent 12 years in Executive Management roles for the McGraw-Hill Companies, and at General Electric. Ken holds a Bachelor's degree in business administration, an MBA, and is a graduate of GE's Financial Management Program.


Susan Winslow

Susan Winslow

GM, Academic Business

Susan's nearly 22-year career in publishing has included working with some of the brightest minds in science, as well as calling on classrooms in the U.S., Canada, Europe, and the Middle East. During her tenure at Macmillan, she has overseen the development of market-defining products that have pioneered integration of print and media working together seamlessly to achieve a set of desired outcomes for students.


Adam Black

Adam Black

Chief Strategy & Learning Officer

Adam is a recognized pioneer in improving learning outcomes. From identifying promising areas of learning science, to directing the development of market-leading digital products, and spearheading novel approaches for assessing impact, Adam brings more than 25 years of experience to Macmillan Learning. Adam holds a BSc from the University of Edinburgh and a PhD in Astrophysics from the University of Cambridge, has two patents pending in analytics innovation, and has won several awards in digital innovation.


Chelsea Valentine

Chelsea Valentine

Chief Technology Officer

A transformational leader with over 20 years of experience in both product and technology, Chelsea brings deep knowledge to our technology teams. She is the author of over a dozen books on Web application and design, XML, XSLT and other XML technologies, and an active participant in the Agile and Lean communities.


Craig Bleyer

Craig Bleyer

GM, Institutional Business

Highlights of Craig's impressive 25-year career in publishing include launching the popular Economics by Paul Krugman and Robin Wells, as well as Calculus by Jon Rogawski, during his time as a Senior Publisher at Bedford, Freeman & Worth. He also succeeded at developing a strategy to grow Bedford's High School unit by integrating sales, marketing, and editorial operations, and restructured the sales organization while publishing new titles designed specifically for the AP community.


Simon Horrer

Simon Horrer

Senior Vice President, Finance

Simon brings a passion for excellence and vision for fiscal simplicity, reporting, and operational support to Macmillan Learning. He was most recently a member of the Holtzbrinck Finance and Accounting team, where he managed all group reporting, subsidiary relations, and merger and acquisition projects. Before joining Holtzbrinck, Simon gathered broad business and financial experience across a variety of media-related industries at the audit and consulting firm Ebner Stolz in Germany.