Why Veristat
Executive Leadership
Veristat is a dynamic and evolving organization backed by 29 years of expertise driven by scientific excellence. The company continues to grow because of the vision, hard work, and experience of its leadership. Our leaders are futurists, forward-thinkers who not only look to help our clients bring new life-improving and life-saving therapies to market today.
Meet our dynamic visionaries and leaders.

Patrick Flanagan
Chief Executive Officer

Patrick Flanagan
Chief Executive Officer
Patrick has built an impressive career—effectively leading organizations, successfully driving commercial growth and international expansion, and profoundly impacting healthcare around the globe. Prior to joining Veristat in 2013, Patrick supported the success of organizations across the consulting, healthcare, and software fields in business and financial management roles with increasing responsibility including at A.T. Kearney, Baxter International, Allegiance Healthcare and Oracle. Patrick served as Chief Operating Officer of Certara and the General Manager of Certara’s Pharsight Consulting Services Group, a Vector Capital portfolio company engaged in the business of providing consulting services and software to pharmaceutical and biotechnology companies.
Patrick plays an active role as an advocate of the rare disease community. Patrick, his family, and the Veristat team have been annual supporters for 8 years of Memorial Sloan Kettering's Cycle for Survival, the movement to beat rare cancers. Together, they have generated approximately $500,000 for cancer research.
Beyond realizing successful business and financial results, Patrick has fostered a positive and inclusive corporate culture where employees are valued and recognized. He has been a steadfast champion of Veristat’s corporate values, rooted in teamwork and scientific excellence, viewing them as essential in helping to bring new therapies to market to save and extend lives.
Patrick holds a BS in Business from Penn State University and an MBA with a concentration in Finance and Marketing from the Kellogg Graduate School of Management at Northwestern University. Patrick is also an active father, skier, golfer, occasional marathon runner and aging tri-athlete.

John P. Balser, PhD
Founder, President, and Chief Statistical Officer

John P. Balser, PhD
Founder, President, and Chief Statistical Officer
Prior to founding Veristat in 1994, John served as Vice President, Biostatistics, and Data Management at Medical & Technical Research Associates, Inc. He has held positions of increasing responsibility in the biostatistics departments at various pharmaceutical companies including E.R. Squibb, Biogen, and Miles.
John received his MS and PhD in Biometrics from Cornell University, and has been actively engaged in clinical biostatistics for over 30 years. John is an avid runner and has competed in the Boston Marathon.

Barbara Balser, VMD
Founder, Executive Vice President, and Chief Scientific Officer

Barbara Balser, VMD
Founder, Executive Vice President, and Chief Scientific Officer
Barbara has participated in the writing, oversight, and submission of multiple marketing applications to US, Canadian, Japanese, and European Union regulatory authorities. Prior to co-founding Veristat, Barbara served as Associate Director of Clinical Research at Medical & Technical Research Associates, Inc. where she was responsible for strategic planning, design, and management of clinical development programs; preparation and submission of regulatory applications; and scientific communications.Barbara began her career in the pharmaceutical industry at Miles, Inc. (currently Bayer Corporation). In her capacity as Assistant Director of Clinical Research at Miles, Barbara assisted with strategic planning for the clinical development of anti-infective compounds from Phases 2 to 4 and with the planning, writing, and compilation of two successful NDAs for anti-infective products. Prior to joining the pharmaceutical and biotech industry, Barbara practiced veterinary medicine at a private veterinary hospital. Barbara holds a BS in Chemical Engineering from the University of Pennsylvania, School of Engineering and Applied Science, and a VMD from the University of Pennsylvania, School of Veterinary Medicine. When Barbara isn’t busy traveling the world for our clients, she enjoys spending time on the beach with a good book.

Joe Scott
Chief Financial Officer

Joe Scott
Chief Financial Officer
Joe has a reputation for being an action oriented, engaged, and knowledgeable financial leader. He is known for driving company growth in collaboration with functional teams, often rolling up his sleeves and mentoring high performing teams, bringing competencies in corporate finance and ensuring regulatory compliance. The thoughtful insights Joe brings to the executive team strongly support the value we deliver to our clients.
Prior to joining Veristat, Joe served as Chief Financial Officer at Advanced Group, focused on establishing the financial infrastructure, improving efficiencies and driving top line growth for a CRO / staffing company. Prior to that, Joe was at Parexel where he held positions of increasing scope and responsibility, most recently serving as Senior Vice President, Strategic Finance. Joe led the organization through significant expansion, managing a substantial global budget, enhancing internal controls and overseeing the global talent upgrade of the Finance department which resulted in an efficient team aligned with metrics-driven performance.
Joe graduated from University College, Cork, with a Bachelor of Commerce Honors Degree. He is expert in Six Sigma process improvements and Sarbanes Oxley compliance controls. Joseph was born and raised in Ireland and remains an avid fan of both the Patriots and Liverpool.

Colleen Pelton
Chief Talent Officer

Colleen Pelton
Chief Talent Officer
Colleen has dedicated her entire career to human resources roles across a variety of industries, the majority of which have been healthcare-related. Her wide-ranging expertise spans the design and implementation of global talent management and acquisition-related initiatives for billion-dollar global enterprises operating in 30+ markets with thousands of employees.
Prior to joining Veristat in 2021, Colleen served as Senior Vice President, People and Performance for Dental Services Group, leading the HR function. From 2014-2016, Colleen served as Senior VP, HR Leader at St. Jude Medical, Inc. where her responsibilities included developing a multi-year road map to evolve the broader organizational structure and capitalize on high growth opportunities. From 2004-2014, Colleen served in global HR roles with increasing responsibility at Smith & Nephew PLC, leading transformative global HR initiatives, harmonizing HR processes globally, mentoring management and improving the employee experience.
Colleen graduated from the University of Florida where she received a B.A. in Communications. When reflecting on her career, Colleen expresses her heartfelt satisfaction from supporting organizations that help people live longer, healthier lives. She brings a reputation for fostering a positive workplace culture and helping employees adapt to ever-changing work environments.

Cindy Henderson
Chief Commercial Officer

Cindy Henderson
Chief Commercial Officer
Prior to joining Veristat in 2007, Cindy served as the Senior Manager of Training, Innovations and Processes at Averion International Corporation where she led various initiatives to create and improve standard operating procedures, while implementing new technologies for data management and was a member of the integration team for several key corporate acquisitions. While at Parexel International Corporation as the Associate Director of Data Management, Cindy managed several international clinical trials, developed SOPs and processes, provided training and participated in software development, validation, and implementation efforts.
Outside of Veristat Cindy is a Board Member and Supervising Judge for the North American Flyball Association. She also competes in this fun and fast paced sport with her two border collies as part of the Patriot Flyball Team.

Elizabeth R. Madichie, Ph.D.
Executive Vice President, Global Regulatory Affairs

Elizabeth R. Madichie, Ph.D.
Executive Vice President, Global Regulatory Affairs
Proficient in building constructive relationships with global health authorities, policymakers, and key opinion leaders, Elizabeth possesses expert knowledge of the regulatory and commercial environment and legislative framework for biopharmaceuticals worldwide, enabling the development and commercialization of innovative and established products and services across 160+ countries. She has extensive management experience overseeing teams of up to 800 direct and indirect reports internationally.
As an active industry advocate and thought leader, Elizabeth proactively pursues opportunities to advance the regulatory paradigm. She currently serves as Past-President and Board Director of The Organization of Professionals in Regulatory Affairs (TOPRA), leading the promotion of healthcare regulatory affairs, provision of exceptional support, world-class education and definitive accreditation of regulatory professionals in practice.
Prior to joining Veristat, Elizabeth held leadership positions at emerging and established organizations, including GSK, Elan, Taro Pharmaceuticals and Porton Biopharma, as well as the CRO, PPD where she ran all aspects of regulatory affairs, facilitating the clinical development of new products and their successful licensing and subsequent support/maintenance in the marketplace.
Elizabeth graduated from the University of Hull, with a Ph.D. in Analytical Chemistry, an M.Sc. in Analytical Science, and a B.Sc. (Hons) in Chemistry with Analytical Chemistry and Toxicology. She is the recipient of numerous impact awards recognizing her dedication to the sciences and commitment to regulatory affairs excellence and is a Chartered Chemist (CChem), Fellow of the Royal Society of Chemistry (FRSC), Fellow of the Chartered Management Institute (FCMI) and Registered Member of TOPRA (MTOPRA).

Natalia Grassis
Executive Vice President Global Clinical Operations and Delivery

Natalia Grassis
Executive Vice President Global Clinical Operations and Delivery
An accomplished business executive with 20+ years in roles with increasing responsibility at global clinical research organizations, Natalia brings extensive knowledge across all phases of clinical development spanning a broad range of therapeutic areas including infectious disease (COVID), gene therapy, rare disease, oncology and CNS. Her deep experience implementing business process improvement initiatives and driving innovative research with patient-centered virtual clinical trial solutions has resulted in accelerated drug development timelines for clients.
Prior to joining Veristat in 2022, Natalia worked at Parexel International for over a decade, most recently as Corporate Vice President (CVP) Parexel Biotech Americas, and previously as CVP Global Clinical Operations where she led a team of 2,500 across Asia Pacific (APAC), Europe, Middle East and Africa (EMEA) and Americas, responsible for site management and operations worldwide.
Prior to Parexel, Natalia held leadership positions at PPD where she built and directed high-performing teams responsible for ground-up site start-up implementation in Latin America. Natalia’s passions include talent development strategies, diversity and inclusion initiatives both within clinical trials as well as on her global teams, and process improvement programs using lean methodologies.
Natalia graduated from the School of Biochemistry, Rosario National University, with a degree in Biochemistry, and subsequently completed post graduate studies at Belgrano’s University with a degree in Management.

Nan Shao, Ph.D
Executive Vice President Global Operations

Nan Shao, Ph.D
Executive Vice President Global Operations
A successful business leader, clinical research professional, and statistician with 19 years of pharmaceutical industry experience and ten years leading global biometrics operations and strategic divisions, Nan brings extensive expertise in analytics strategy, biostatistics, statistical programming, data management, pharmacokinetics, and data standards. She is highly skilled in the clinical development life cycle across a range of therapeutic areas, collaborating with sponsors to achieve their operational and business goals.
Prior to joining Veristat in 2022, Nan served as Global Head of Analytics Strategy, Global Head of Biostatistics and Statistical Programming, and Global Head of Clinical Data Services at Parexel International where she led the global operations and strategy teams, championing a first-time quality mindset, promoting analytics innovations and driving the advancement of clinical research through real-world evidence (RWE), decentralized clinical trials (DCTs), and AI/ML applications.
Prior to Parexel, Nan held leadership positions at organizations that included Covance/LabCorp, Premier Research, and pharmaceutical companies where she built and directed high-performing teams responsible for statistical activities related to regulatory strategies, clinical development programs, study designs, and trial optimization. Nan has served as a mentor and subject matter expert both within organizations and the clinical operations community-at-large, participating in industry-wide forums as an expert statistician to help solve complex problems.
Nan graduated from Rutgers University with a Ph.D. in Ecology and M.S. in Statistics, and from Peking University with a B.S. in Environmental Sciences and an LL.B. in Intellectual Property Law. Nan is an MBA candidate at the University of Oxford. She is a certified Six Sigma Green Belt by the American Society for Quality since 2007.

Montserrat (Montse) Barceló Riera, MD
Vice President, Europe

Montserrat (Montse) Barceló Riera, MD
Vice President, Europe
Dr. Barceló received her medical doctor degree from the University of Barcelona in Spain in General Medicine and Surgery. She started her pharma services career as the General Manager for Spain at Clinical Data Care, a Swedish data management CRO. Later in her career, she joined the Scandinavian CRO, TFS, as Regional Managing Director, ascending to the role of Global Chief Operating Officer, where she was responsible for 18 countries globally and more than 600 clinical research professionals across 23 affiliate locations.
Team Member Name
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