Gregory J. Dennis, MD, is a distinguished physician-executive whose four-decade career reflects a rare fusion of clinical mastery, strategic leadership, public service, and global healthcare influence. His journey began in the discipline and commitment of military medicine and evolved into senior leadership roles across some of the world’s most respected healthcare and biopharmaceutical organizations. Throughout his career, Dr. Dennis has remained steadfast in his belief that transformative healthcare requires not only scientific innovation but compassionate leadership anchored in service to patients, employees, and the broader medical community.
From the outset of his professional life, Dr. Dennis demonstrated an unwavering dedication to advancing clinical medicine. After earning his medical degree from St. Louis University he entered military service where he completed rigorous training in internal medicine and rheumatology, and quickly emerged as an exceptional leader within the U.S. Army Medical Corps. His work at institutions such as Walter Reed Army Medical Center and the National Institutes of Health (NIH) shaped his early expertise in rheumatology, clinical care, and research operations. His tenure at the NIH’s National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) marked a pivotal era in his career, as he led clinical programs, mentored emerging physicians, and played a central role in advancing research initiatives designed to improve patient outcomes.
As his responsibilities grew, so did his influence. Dr. Dennis transitioned into key leadership roles within the biopharmaceutical industry, beginning with MedImmune, where he contributed to clinical development strategies and early-phase research programs. He subsequently joined Human Genome Sciences (HGS), where he was instrumental in shaping the medical affairs infrastructure and supporting the development and approval of Benlysta, a milestone therapy for systemic lupus erythematosus (SLE). His ability to bridge scientific understanding, regulatory insight, and stakeholder communication made him a trusted voice among both internal leadership and external medical communities.
His expertise expanded even further during his time with UCB, where he led immunology efforts within U.S. Medical Affairs. In this capacity, Dr. Dennis forged impactful relationships with academic leaders, patient advocacy groups, and regulatory bodies. He championed research integrity, helped advance new indications for key therapies, and strengthened the company’s scientific presence across rheumatology and gastroenterology. These experiences fortified his reputation as a values-driven executive capable of shaping meaningful healthcare strategies while upholding the highest standards of scientific and ethical conduct.
Dr. Dennis’s leadership continued to deepen at PPD, where he oversaw global product development efforts in immunology, rare disease, nephrology, and general medicine. In this role, he served as a strategic partner to operational and business development teams, lending his clinical expertise to large-scale trials and cross-functional initiatives. His contributions helped strengthen PPD’s reputation as a premier partner to biopharmaceutical innovators seeking to navigate the complex terrain of clinical development.
His most influential executive chapter unfolded at IQVIA, where he served in multiple senior vice president roles across therapeutic science, strategy, public health, and external affairs. As the head of the therapeutic science and strategy unit, Dr. Dennis oversaw 16 therapeutic centers of excellence and led high-impact initiatives that aligned clinical research with real-world clinical care. From shaping vaccine trial proposals for government agencies to expanding clinical opportunities for veteran populations through the VA Clinical Trials Consortium, his work consistently reflected a mission-driven approach to innovation. He became a key figure in integrating clinical trial strategy into broader healthcare delivery frameworks, ensuring that scientific advancement remained responsive to the needs of diverse patient communities.
Across every leadership position, Dr. Dennis has embodied strategic clarity, operational excellence, and an authentic commitment to advancing public health. He has collaborated extensively with federal agencies, biopharmaceutical stakeholders, academic institutions, and patient advocacy organizations. His contributions have strengthened regulatory pathways, elevated clinical trial design, and helped shepherd critical treatments from concept to market. His influence extends beyond organizational walls, supported by decades of publications, public speaking engagements, and advisory involvement in national and international healthcare initiatives.
Beyond his professional accomplishments, Dr. Dennis is guided by deep personal values rooted in service, mentorship, and continuous improvement. He has spent his career developing others—whether young physicians, cross-functional teams, or emerging scientific leaders—believing that the future of healthcare rests in the hands of those we nurture today his work across government and private-sector ecosystems, has shaped his global perspective on healthcare accessibility, equity, and innovation.
Dr. Dennis remains driven by a passion for creating positive impact. His personal interests, including music and exercise, reflect a balanced approach to leadership and well-being. With over forty years of diverse experience spanning clinical medicine, research, government service, and executive leadership, he now seeks to bring his insights to forward-thinking organizations through board service. In doing so, he aims to support companies that share his commitment to improving lives, empowering employees, and advancing meaningful healthcare solutions.
Character:
Dr. Dennis consistently demonstrates integrity, compassion, and an unwavering commitment to service. He approaches leadership with humility and respect, valuing the contributions of individuals across all levels of an organization. His decisions reflect a strong ethical foundation shaped by decades of responsibility in both military and civilian healthcare environments.
Knowledge:
His extensive clinical, scientific, and strategic expertise reflects a lifetime of learning and professional growth. He brings exceptional depth in therapeutic development, medical affairs, and healthcare systems management. His ability to integrate scientific rigor with real-world healthcare needs distinguishes him as a trusted advisor and industry leader.
Strategic:
Dr. Dennis excels in navigating complexity, shaping long-range initiatives, and aligning diverse stakeholders toward shared objectives. He has a demonstrated talent for transforming ideas into actionable strategies that strengthen organizations and accelerate innovation. His vision consistently anticipates emerging trends and prepares teams to meet future challenges with confidence.
Communication:
He communicates with clarity, purpose, and empathy, ensuring alignment while fostering collaborative engagement. His experience presenting to global audiences, regulatory bodies, and academic institutions underscores his ability to convey complex concepts with precision. He adapts his communication style to diverse audiences, making him an effective connector across scientific, operational, and executive domains.
