Core Leadership

Executive Core’s cadre consists of top rated coaches and facilitators from Lore International Institute, Korn Ferry, GE, the Rotman School of Management, Bristol-Myers Squibb, Towers Perrin, among other notable organizations.


Barbara Singer
President and
Chief Executive Officer

Barbara SingerPresident and
Chief Executive Officer

Barbara Singer is the founder, president, and CEO of Executive Core and leads a group of 150+ global professionals whose mission is to more quickly innovate professional development globally for corporations and business schools alike. In the last 15 years, Barbara has worked with thousands of high-potentials leaders around the globe at critical turning points in their careers. Barbara has dedicated her career to developing leaders who remain focused on the business priorities, anticipate the future, and remove obstacles. She is passionate about future trends in learning and has been researching predictors of executive success for nearly two decades.

She has conducted research on global influence, and executive coaching for nearly two decades, and has worked with three of the five largest international executive search firms responsible for placing a large majority of C-suite executives. Barb and her team also collaborate with the international Executive MBA council and many business schools around the world to help better prepare leaders for senior roles.

Sara Campbell
Engagement & Financial Director

Sara CampbellEngagement & Financial Director

Proven 15 year track record of progressive and diverse financial accomplishments as the operations manager for Major Northeast Ohio Health System, Sara was instrumental in the success of the organization’s fundraising and charitable contributions. Sara’s keen eye and attention to detail made her the perfect fit for Executive Core. Today Sara serves as the liaison between our clients and our cadre providing assistance with staffing engagements and project updates for talent management. In addition, Sara oversees the assessment center, contracting and invoicing

Susan Poremba
Chief of Staff

Susan PorembaChief of Staff

As a Clinical Marketing Specialist and Sales Specialist with over 35 years of experience in the medical arena driving markets,
providing growth in designated territories, Susan mastered the ins and outs of sales and territorial prospecting and achieved membership in the Americas President’s award Club with a large global player in the Healthcare industry. Later honored with an invitation to join the Executive Core team, she spends her time focusing on program management, strategic initiatives and connecting with others in the field Executive Talent Management.

Joy Lubeck
International Staffing and Project Management

Joy LubeckInternational Staffing and Project Management

Joy Lubeck has worked with dozens of name brand organizations around the world, helping them to achieve their executive education and human capital development goals. An expert in global business management, her focus areas include Business Strategy and Implementation, Leadership
Development, Talent Management, and Executive/Leadership Coaching.

Joy’s results and metrics-focused approach have made her the resource of choice in many high performing organizations. She has positively impacted many organizations and leaders as she has consultatively engaged and collaborated with corporations who are in the process of actively re-thinking both their talent management and business strategies Joy has served successfully at all organizational levels, including the Board Level, of many prestigious companies with financial services, retail, and healthcare.

Joy is sought after for her expertise as a business strategy consultant and relationship management professional in the area of global business and strategic leadership development, by both for-profit and non-profit organizations.