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Billionaire Profile
Dennis Gillings
Global Rank
#1749

Image: Richter Frank-Jurgen | CC BY-SA 2.0 | via Wikimedia Commons

Dennis Gillings

CEO, Clinical trials
Durham, North Carolina
Real-Time Net Worth
$2.40B
Estimated based on Clinical trials stock value as of September 10, 2026
-0.19% (24h)
Age
81
Source
Clinical trials
Industry
Healthcare
Citizenship
United Kingdom

Biography

Sir Dennis Gillings is a British-American statistician and entrepreneur with a net worth estimated at $2.2 billion, as of 2024. He is best known as the founder of Quintiles Transnational, a pioneering clinical research company. Gillings' career began in academia, where he taught biostatistics. In 1982, he transitioned to the business world, founding Quintiles with the goal of accelerating and improving clinical trials. Through his leadership, Quintiles became the largest provider of clinical trials and commercial marketing services to the pharmaceutical and biotechnology industries. Gillings retired as executive chairman of Quintiles, now IQVIA, in 2015. He has also been recognized for his philanthropy, including a significant donation to UNC Chapel Hill, and was knighted in 2020 for his contributions to life sciences research.

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Data Updated
Sep 10, 2026
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Wealth Over Time

Net Worth History

YearNet Worth
2026$2.40B
2025$2.20B
2024$2.20B
2020$1.20B

Portfolio Holdings

IQVIA

IQVIA

IQVhealthcare
Durham, North Carolina, U.S.
82000+ employees
Founded 1982

In-Depth Profile

Early Life

Dennis Barry Gillings was born on April 25, 1944, in London, England. He earned a BSc degree in Mathematics in 1966 and a PhD in Mathematics in 1972 from the University of Exeter. He also earned the equivalent of a master's degree in mathematical statistics from the University of Cambridge.

Rise to Success

Gillings began his career as a professor of biostatistics at the University of North Carolina at Chapel Hill in 1971. In 1982, he founded Quintiles Transnational Corporation, a clinical research organization (CRO). Under his leadership, Quintiles became the world's largest provider of clinical trials and commercial marketing services. He took Quintiles public in 1994. Gillings retired as executive chairman of Quintiles, now IQVIA, in 2015.

Key Business Strategies

Gillings's key business strategy involved recognizing the need for more efficient clinical trials and creating a company to provide that service. He focused on managing and streamlining the drug development process. Quintiles offered comprehensive services, handling all phases of clinical research, data management, and commercialization support.

Philanthropy

Gillings has been involved in philanthropy. In 1998, he endowed the Dennis Gillings Professorship of Health Management at the University of Cambridge. In 2007, he and his first wife, Joan, donated $50 million to UNC Chapel Hill, which led to the renaming of the School of Public Health to the Gillings School of Global Public Health in 2008.

Career Milestones

1971

Professor at UNC

Began teaching biostatistics at the University of North Carolina at Chapel Hill.

1982

Founded Quintiles

Founded Quintiles Transnational, a clinical research organization.

1994

Quintiles IPO

Took Quintiles public through an initial public offering.

2004

Commander of the Order of the British Empire

Appointed Commander of the Order of the British Empire (CBE) for services to the pharmaceutical industry.

2015

Retired as Executive Chairman of Quintiles

Retired from the position of Executive Chairman of Quintiles.

2020

Knighted

Knighted in the 2020 New Year Honours for services to the advancement of dementia and life sciences research.

Philanthropy & Social Impact

Education

Gillings School of Global Public Health

$50M

Donated to UNC-Chapel Hill to rename the School of Public Health

Education

Dennis Gillings Professorship of Health Management

Endowed at the University of Cambridge

Billionaires Connected to Dennis Gillings

Peers in Healthcare

All Healthcare billionaires

Richest in United Kingdom

All billionaires from United Kingdom

Adjacent Global Ranks

Full global ranking

Frequently Asked Questions

What is Dennis Gillings's net worth in 2026?
As of 2026, Dennis Gillings's estimated net worth is $2.396 billion, ranking #1749 among the world's billionaires. The estimate is based on publicly available shareholding data and market prices, updated daily.
How did Dennis Gillings make their money?
Dennis Gillings's wealth primarily comes from Clinical trials, most notably through Clinical trials.
Where is Dennis Gillings from?
Dennis Gillings is from United Kingdom.
How old is Dennis Gillings?
Dennis Gillings is 81 years old.

Sources & References

  1. Dennis Gillings — Forbes profile Forbes
  2. Dennis Gillings — Wikipedia Wikipedia