Our Senior Team


Greg T. Billings
Chief Executive Officer 

Greg has taken the helm of CTeL Innovations while remaining executive director of our nonprofit parent organization, the Center for Telehealth & e-Health Law. He brings vast experience with legislative and regulatory activities on Capitol Hill.

Greg has served as senior government relations director at a Washington, DC, law firm, senior aide and deputy chief of staff to two senior U.S. senators, and chief of staff to the administrator of the Farm Service Agency, the largest agency within the U.S. Department of Agriculture (USDA) with over 13,000 employees in all 50 states and the U.S. territories.

A well-known and sought-after presenter on telehealth legal and regulatory issues, Greg was an informal technical advisor to congressional and executive branch policymakers during recent credentialing and privileging “by proxy” issue. He also provided technical information on the impact of proposed Centers for Medicare and Medicaid Services’ credentialing and privileging requirements on telehealth providers. He recently authored draft language for physical examination requirements for telehealth encounters resulting in prescription. This language was sent to all 50 state medical boards.


Christa Natoli
Vice President

As Vice President of CTeL Innovations, Christa oversees all business development efforts and strategic operations. She has extensive experience in policy matters and has developed strong relationships with all 50 state medical boards, senior members of Congress, foreign embassies, the United Nations and World Health Organization. 

Christa has particular expertise in prescribing and physical examination requirements for telehealth encounters. She also has deep knowledge of issues related to mHealth, reimbursement, physician and nurse licensure and international telemedicine. 

Before joining CTeL, Christa has worked as business development director and public relations and marketing advisor with companies and nonprofits and has experience with state level and congressional campaigns, grassroots organizing, strategy and research. 

Christa is a published author and noted lecturer and speaker. Before graduating from Harvard, Christa devoted two years to conducting ground-breaking research on international telemedicine adoption and acceptance in remote, rural regions of Pakistan. She also assisted in editing former Pakistani Prime Minister Benazir Bhutto’s bestseller, Reconciliation: Islam, Democracy and the West, for which she received a special thank you in the book’s acknowledgments.


Nina Hamilton-Lee, MBA
Director, Business Model Development

Nina offers deep insights in telemedicine initiatives, physician and employee recruitment, operations management, strategic planning, project management, and process and policy development. Her skills in building teams and streamlining processes were honed over 15 years driving growth and expansion for start-ups, expansions and world-class organizations.  

Nina directed telemedicine operational and policy development as former COO of Activ Doctors Consult in Coral Gables, Fla. As a business leader, she has managed all facets of nationwide business and financial/lending operations, from development in global markets and public policy positions to loan portfolio analysis, training and risk analysis.

Nina also invests her energy and skills in the community as executive officer or board member for nonprofits including Dress for Success, The Institute for Child and Family Health (ICFH), The Commonwealth Institute (TCI) and the Bayview Foundation. Named among the “40 Under 40 Most Influential Black Professionals of 2006” by Success South Florida Magazine, Nina holds an MBA and a BS in International Business.


Garret Spargo
Director, Technology

Garret has over a decade of experience in the telehealth industry. He has expertise in assessing technologies, and developing and testing software applications and networks, product planning and compliance documentation for clearance of FDA medical devices. One of his most valuable skills is coordinating communications among program participants: internal and external customers, software developers, testing staff and systems integration personnel.

In 2009, Garret established the Telehealth Technology Assessment Center and served as its director. There, he created webinar presentations and online educational toolkits teaching the fundamentals of telehealth-related technology assessment for 13 different technologies. Garret also served as co-chair from 2011 to 2012 of the Internet-Based Telemental Health Working Group of the American Telemedicine Association.

He has created an extensive body of work, including “Human Factors in Technology,” published in Telemental Health: Clinical, Technical, and Administrative Foundations for Evidence-Based Practice (2012, Elsevier Publishing); presentations – “Telehealth Technology – Matching the Right Products to Your Services” and “Technology Assessment – Why It Matters, How to Do It, and Who Can Help,“ for the Office for the Advancement of Telehealth (2011).

Garret has a BA in English and is working toward a master’s degree in social science.