Billionaire Profile
Dennis Gillings
Global Rank
#1736

Image: Public domain | via Wikimedia Commons

Dennis Gillings

CEO, IQVIA
GB
Real-Time Net Worth
$3.02B
As of December 2025
Age
81
Source
Clinical trials
Industry
healthcare
Citizenship
GB

Biography

Sir Dennis Barry Gillings, born in London on April 25, 1944, is a British-American statistician and entrepreneur. His estimated net worth is $3.02 billion, derived from his work in clinical trials and as the founder of IQVIA. He is known for founding Quintiles in 1982, a clinical research organization, which later became IQVIA. Gillings' career includes significant achievements like endowing the Dennis Gillings Professor of Health Management at the University of Cambridge. He is also recognized for his philanthropy and contributions to the pharmaceutical and biotech industries. Gillings received a knighthood in 2020 for his contributions to dementia and life sciences research.

Wealth Over Time

In-Depth Profile

Early Life

Sir Dennis Barry Gillings was born in London, England, on April 25, 1944. He earned a BSc in mathematics in 1966 and a PhD in mathematics in 1972 from the University of Exeter. He also holds a master's degree equivalent in mathematical statistics from the University of Cambridge. His early academic training laid the foundation for his later success in the pharmaceutical and healthcare industries.

Rise to Success

Gillings began providing statistical consulting and data management services to pharmaceutical clients in 1974. He founded Quintiles in 1982, a contract research organization (CRO), with the aim of making clinical trials faster and more efficient. In 1994, he took Quintiles public through an IPO. Under Gillings' leadership, Quintiles grew into the largest global provider of clinical trials and commercial marketing services to the pharmaceutical and biotechnology industries. Quintiles later merged with IMS Health in 2016 and rebranded as IQVIA.

Key Business Strategies

Gillings' vision was to revolutionize healthcare by providing data-driven insights. Quintiles expanded rapidly, acquiring smaller companies and entering new markets. He focused on building a network of doctors for clinical trials and standardizing steps in drug development, which contributed to the company's global success.

Philanthropy

Gillings is known for his philanthropy, particularly in supporting medical research, public health, and education. He endowed the Dennis Gillings Professor of Health Management at the University of Cambridge. He donated $50 million to the University of North Carolina in 2007.

Career Milestones

1966

Graduated

Earned a BSc in mathematics from the University of Exeter.

1972

Graduated

Earned a PhD in mathematics from the University of Exeter.

1982

Founded Quintiles

Founded Quintiles Transnational, a clinical research organization.

1994

IPO

Took Quintiles public through an IPO.

2004

CBE

Appointed Commander of the Order of the British Empire.

2020

Knighted

Knighted in the 2020 New Year Honours.

Philanthropy & Social Impact

Education

Gillings School of Global Public Health

$50M

Donated to the University of North Carolina, which named the school in his honor

Education

Dennis Gillings Professor of Health Management

Undisclosed

Endowed the professorship at the University of Cambridge.

Business Philosophy & Leadership

Notable Quotes

"It became apparent that there was the possibility of making the pharmaceuticals sector more efficient."

Leadership Principles

Data-Driven Decision Making

Emphasizing the use of data and analytics to make informed decisions in healthcare.

Efficiency in Clinical Trials

Focusing on making drug development and clinical trials faster and more effective.