A. John Blair, III, MD, F.A.C.S

Chief Executive Officer


CUNY-TV’s Talking Health”

Blair is a health care and technology executive with broad experience across the health care industry. MedAllies facilitates physician adoption of health information technology and integrates the health care community to facilitate care coordination, patient-provider communication, public health and quality reporting; it was one of only seven sites selected by the Office of the National Coordinator for Health IT (ONC) to launch a Direct Project pilot. Blair serves on the Privacy and Security Workgroup and the NHIN Workgroup of the Policy Committee of the ONC.

Blair is a member of various committees and boards. He is the Chairman of the Board of Directors of DirectTrust.org. Blair is also past president of Taconic IPA, a nearly 5,000-member physician group at the forefront of transforming health care delivery in the Hudson Valley through meaningful use of health IT and pay-for-performance incentives.

Holly Miller, MD, MBA, FHIMSS

Chief Medical Officer


Miller has well over a decade of health care IT experience. Miller, who joined MedAllies in 2009, is physician liaison for all implementation projects and works closely with the team to design change management programs ensuring optimal utilization of health information technology tools within different healthcare environments. From 2007-2008, she was vice president and chief medical information officer of University Hospitals and Health Systems, where she was the senior clinical executive for information systems and technology responsible for the leadership and vision for the strategic planning, operations, integration and implementation of information systems and services. From 1999-2007, she worked as a health information technology managing director for the Cleveland Clinic, and practicing clinician in general internal medicine. She is a frequent presenter at national meetings on health IT and PHRs and has been active in health care informatics research. A member of HIMSS since 1999, Miller served on the U.S. HIMSS Board from 2008 – 2012 and is a past vice-chair. She was an inaugural member of the HIMSS World Wide Board. She is currently the chair of the DirectTrust Clinical TOC Group, and a member of the Patient and Consumer Participation Group. She also serves on the ONC’s Standards and Interoperability Framework and Transition of Care Initiative workgroups. She earned her MBA at Hautes Etudes Commerciale (HEC) in Paris, and her doctor of medicine at Albert Einstein College of Medicine, New York City.

Dianne Koval, MHSA, RHIA, CPEHR

Chief Operating Officer

Koval has been with MedAllies since its inception in 2001 and is responsible for managing the operations of the professional services division. The division provides a strong focus on successful adoption of health information technology through the use of appropriate change management techniques. She currently oversees Health Information Service Provider (HISP) operations including onboarding, information technology, and support. She has managed the implementation of two national EHR applications, an e-prescribing application, computerized lab order entry systems, personal health record software and two web Health Information Exchange portal applications. She is involved in several national organizations and serves as a career mentor for the University of Pittsburgh health information management program. She has published articles on clinician adoption in several peer-reviewed journals.

Koval has 25 years of experience in health information technology.  Her previous professional positions include director of health information management for several healthcare organizations and professional consulting engagements.  She holds an MS in health services administration from St. Joseph’s College and a BS in health information management from Ithaca College. She is also a registered health information manager (RHIA) and certified professional in electronic health records (CPEHR).

Christopher Llanes

Chief Technology Officer


Llanes has over 20 years of experience in Information Technology.  He joined MedAllies in 2009 and oversees the IT Infrastructure, Application Hosting, Software Development, Certificate Authority, Registration Authority, and Operations teams. Llanes has been instrumental in building out the robust IT infrastructure and support framework needed to deploy MedAllies’ Direct product and service offerings.


Under Llanes’ leadership, MedAllies has successfully launched the MedAllies Direct Solutions™ platform (Health Information Services Provider – HISP), the MedAllies Certificate Authority (CA), and MedAllies Registration Authority (RA), of which have received full accreditation by EHNAC.


Llanes’ previous positions include IT manager of a financial software and consulting services organization, IT manager of an international chemical importer/distributor, and operations manager of an office products distributor.


Llanes holds a BA in Computer Science from SUNY Oswego.


Jeannine Castaldi

Chief Financial Officer

Castaldi develops and executes overall financial strategy designed to meet short-term and long-term business objectives. She and her team provide financial support to all of the areas of MedAllies. Castaldi has experience in private industry as well as public accounting, with a strong focus on internal controls and financial reporting/analysis and process improvements. Prior to joining MedAllies, she held various positions in both accounting and finance at Pepsi Bottling Group and IBM. Most recently, Castaldi was a Manager of Technical Accounting responsible for the US GAAP accounting and reporting of share-based compensation and pension and other post-retirement benefits. She was also an auditor and earned her CPA license at KPMG. Castaldi holds a BS in Accounting and an MBA in Finance, both from Marist College.

James L. Fisher, Ph.D., CISSP
Principal Architect

Fisher joined MedAllies as principal architect in June 2013. He brings more than 15 years of experience in identity management, network security and information security technologies and policies, and more than 20 years in system engineering and architecture development. He comes to MedAllies from Noblis in Falls Church, Va., where he most recently worked on projects for a federal law enforcement agency.

Fisher holds a Ph.D. in electrical and computer engineering from Carnegie Mellon University, where he also earned both bachelor's and master's degrees in electrical engineering. He has published articles in trade journals on a range of information security and technology topics.

 Ethan Yehud, MBA, CISSP, CISA
Chief Information Security Officer

Yehud has an exceptional record of success in the management of corporate technology, IT security operations and security programs in highly regulated industries. He has a consistent history of facilitating business growth and mitigating risk through the delivery of effective solutions to meet rapidly changing business and industry needs. He  excels at building and leading top-performing teams, managing risk assessments, security incident response activities, deploying new technologies to keep pace with technological advancements and ensuring regulatory compliance.

Yehud has specialized expertise in HIPAA, FISMA, HITRUST, NIST, ISO, PCI-DSS and other regulatory requirements.  He has his BS in Computer Science from University of Kentucky, MBA Degree from Indiana University and is a Certified Information Systems Security Professional (CISSP) and Certified Information Systems Auditor (CISA).