AJ Chen, PhD, is the Founder and Principal Investigator of the ELHS Institute. Inspired by the vision of Learning Health Systems (LHS) outlined by the U.S. National Academy of Medicine, AJ has been developing LHS technologies since participating in the First National LHS Summit in 2012. Dr. Chen pioneered the concept of ML-LHS units (published by Nature) and has since led several groundbreaking efforts: benchmarking ChatGPT for disease prediction in collaboration with a Stanford University professor (published in JAMIA), achieving a breakthrough in fine-tuning open-source large language models (LLMs) for accurate, low-cost healthcare predictions, and exploring the use of ChatGPT as a training copilot since the release of GPT-4 (published by JAMA). These efforts have convinced him that democratizing GenAI is the key to realizing equitable LHS worldwide. Dr. Chen now leads the ELHS team on its mission to build predictive healthcare systems through ELHS units globally. Previously, AJ served on the U.S. Department of Health & Human Services (HHS) Region IX Health Equity Council (2011–2016), where he advocated for scalable technologies to reduce health disparities. He also contributed to the Consumer Technology Workgroup of the HHS Federal Advisory Committee on Health IT Standards (2013–2014), where he helped recommend the API method for patient data exchange. AJ is a two-time winner of national developer challenges by HHS, with his first winning project selected by the HHS CTO Office for presentation at the inaugural HHS Health Datapalooza in 2012. Earlier in his career, as Director of Semantic Technology at Healthline Networks, AJ led the development of the AI core powering health search engines like Healthline.com, Yahoo Health, and Elsevier ClinicalKey. He also led the development of genomic software for personalized medicine at Hyseq and collaborated with Nobel Laureate Dr. Barry Marshall to promote the groundbreaking H. pylori theory. Dr. Chen completed postdoctoral fellowships in Immunology at Harvard Medical School and Duke University School of Medicine.