Leadership PresenceBy: Kathy Lubar, Belle Linda Halpern BRING THE TECHNIQUES OF THE STAGE TO THE BOARDROOM. For more than a decade, Belle Linda Halpern and Kathy Lubar have applied the lessons and expertise they have learned as performing artists to the work of their company, The Ariel Group. Halpern and Lubar have helped tens of thousands of executives at major companies around the country and the globe, including General Electric, Mobil Oil, Capital One, and Deloitte.