Fully invested in clients’ success

Every member of the senior management group holds significant equity in Global Telesourcing. This structure, rare in the contact center market, inspires a deeper, more collaborative partnership with clients.

Our team recognizes that we must excel to grow. So we’re not about staying in our own lanes, and we’re not afraid of doing things differently if it’s right for our company and the brands we represent.


tom herrity

Tom Herrity

Founder & Chairman

Tom Herrity oversees the strategic development and direction of Global Telesourcing. Previously, Tom served as Chairman and CEO of Democracy Data & Communications (DDC), the nation’s leading provider of public affairs solutions, with clients including 41 of the Fortune 50. Under Tom’s leadership, DDC was named to the Deloitte & Touche “Fast 50” and the Inc. 500.
In 1988, Tom co-founded The Direct Impact Company, which he grew into one of the largest grassroots lobbying firms in the US. Another Inc. 500 performer, Direct Impact was acquired by Young & Rubicam to augment the international communications giant’s direct outreach and local medial capabilities.

bill colton

Bill Colton

Founder & CEO

Bill began his career more than 25 years ago as a call center agent in a 15-person sales operation above a movie theater in his home town near Philadelphia. Since then, he has started, directed, and managed call center operations for major companies, arts organizations, political candidates and advocacy groups. He has been a phone agent, floor supervisor, operations manager and call center owner.

Prior to co-founding Global Telesourcing, Bill was the Vice President of Communications for Democracy Data & Communications. During his tenure, DDC served 8 of the Fortune 10. He was responsible for running major public affairs programs at the local, state and federal levels for many of the largest companies in the US.

Previously, Bill founded, launched and served as Managing Director for the Latin America division of Optima Direct, then the world’s largest direct marketing agency focused on call center services. After the acquisition of Optima Direct by Omnicom Group, Bill helped affiliated agencies in 12 countries establish call center operations from his base in San Jose, Costa Rica. His experience throughout Latin America served as the basis and inspiration for Global Telesourcing.

riyad abu-sharr

Riyad Abu-Sharr


Riyad joined Global Telesourcing in 2014, bringing to his role as more than 30 years of experience in finance and management. A CPA and Chartered Accountant, Riyad has a comprehensive background that extends beyond financial planning, reporting, treasury and tax specialties to include business operations, project management, client relations and strategic planning.

A highly experienced executive, Riyad previously served as COO/CFO at Omnicom’s Star Marketing, a group of ten digital and direct marketing agencies; COO/CFO of MMG, a health care marketing agency; and COO/CFO of Optima Direct, a telemarketing agency.

mariana ramos

Mariana Ramos


Trained as a chemical engineer, Mariana shifted from an early career in the oil fields to call center leadership. Responsible for all operations, Mariana has led the rapid growth of Global Telesourcing while retaining and enhancing the culture, spirit and staff that define the company. Her leadership style has earned the confidence and support of her leadership team and our clients.

Under Mariana’s watch, Global Telesourcing has grown from approximately 300 FTEs to nearly 1,000 while continually improving sales performance metrics, quality standards and corporate profitability. Prior to joining the company, Mariana was the Chief Operating Officer of Granada Corporation and held Site Director positions for Teleperformance and Convergys.