3D Leadership Senior Team

John F. Middlebrook


John F. Middlebrook launched 3D Leadership, LLC after a successful career with Kepner-Tregoe, Inc., an international management-consulting firm based in Princeton, New Jersey. Mr. Middlebrook culminated 15 years in management at Kepner-Tregoe as managing partner, North America and a member of the Board of Directors. Read More


Deborah C. Mather

Managing Partner

Deborah C. Mather brings to 3D Leadership over 25 years of leadership and organization development experience. She is uniquely qualified to help organizations formulate their human capital needs and select and integrate executives into top-level positions. Read More


Dale Corey

Director of Research

Dale Corey has been director of research for 3D Leadership, LLC since the firm’s inception. Prior to joining 3D Leadership, Ms. Corey was a member of the Research Department of CHM Partners International, LLC, a global leader in retained executive search and management consulting. At CHM, she was responsible for the initial identification, interviewing, and assessment of candidates for senior management positions in a cross-section of industries. Read More


 Natalia Bilash

Director of Talent Acquisition

Natalia Bilash has 12 years’ experience in retained executive search. Prior to joining 3D Leadership, she worked in several search firms specializing in the life sciences, consumer goods, and pharmaceutical industries. Through her focus on relationship building and her extensive networking skills, Ms. Bilash helps 3D Leadership identify outstanding talent to fill clients’ executive positions. Read More