ATHN Welcomes Robert F. Sidonio, Jr., MD, MSc, as Fellow Physician in the Advanced Clinical Research Fellowship

October 13, 2026 – The American Thrombosis and Hemostasis Network (ATHN) is pleased to announce that Robert F. Sidonio, Jr., MD, MSc, will join the ATHN team as Fellow Physician in the ATHN Advanced Clinical Research Fellowship.

The fellowship is an advanced training experience designed for an experienced hematologist with extensive clinical expertise in hemophilia and other bleeding disorders and a strong background in clinical investigation.

Dr. Sidonio will work with ATHN’s research staff to implement new data quality processes supporting our national research agenda in congenital bleeding disorders. He will also collaborate with the ATHN Physician Think Tank to promote the development of investigator-initiated research.

A nationally and internationally recognized leader in pediatric hematology, Dr. Sidonio brings extensive experience in clinical research, patient care and mentorship. During his 12 years at Emory University and Children’s Healthcare of Atlanta, he led the hemostasis and thrombosis team, pediatric hemophilia treatment center and Aflac Clinical Research Office. His leadership advanced multidisciplinary care, including the development of a women and girls clinic and clinical pathways addressing heavy menstrual bleeding.

Dr. Sidonio has led numerous investigator-initiated and industry-sponsored trials focused on hemophilia and von Willebrand disease, including the MOTIVATE and SAFE studies. He has also mentored junior faculty, fellows and trainees, helping prepare the next generation of bleeding disorders researchers and clinicians.

His leadership extends across the bleeding disorders community, including his current service as ATHN Chair, medical advisor for the Hemophilia Federation of America and Clinical Chair for the 2027 International Society on Thrombosis and Haemostasis Annual Meeting Planning Committee.

Dr. Sidonio will conclude his tenure at Emory and Children’s Healthcare of Atlanta on December 31, 2026.

Please join us in welcoming Dr. Sidonio to the ATHN team. We look forward to his contributions as we work together to secure data, advance knowledge and transform care.

About ATHN
The American Thrombosis and Hemostasis Network (ATHN) is a non-profit, 501(c)3 whose mission is improving the health and well-being for individuals with rare disorders. ATHN provides a national informatics platform and partners with 150 ATHN-affiliated blood disorder treatments centers, government programs, community-based organizations, and industry partners to conduct research, public health surveillance, and quality improvement initiatives that support clinical care and outcomes analysis.

Media Contact
jgivens@athn.org