KOLs definition

KOLs are experts that can influence the behavior of others, meaning KOLs can sway minds and markets.

What is a Key Opinion Leader (or KOL)?

A Key Opinion Leader (or KOL) is an expert or thought leader within the scientific community who has earned the trust of their peers for specific concepts .

Key Opinion Leaders are also called influencers, experts, or thought leaders , and in the post-pandemic world, the terms "DOLs" (digital opinion leaders) and Influencers (marketing) have also gained popularity.

What is KeyOpinionLeaders.com, and how can it help you?

KeyOpinionLeaders.com is a free search engine that lets you find Key Opinion Leaders . You can enter any concept on the search bar at the top of this page and use it to find the top Key Opinion Leaders instantly for that concept. You can filter your results by other concepts, organizations, and locations.

Imagine a search engine similar to that popular search engine you probably use to find websites, only that instead of searching through websites, it could search through people who are considered experts for specific concepts. That's what KeyOpinionLeaders.com does.

What are other synonyms for KOLs?

Depending on the context, other synonyms for Key Opinion Leader could be Influencer , KOLs (Marketing) , Digital Opinion Leader , DOLs , Thought leader , Knowledge leader , Key Opinion Influencer or KOi .

Key opinion leader Dr. Sanjay Gupta - photo: IG drsanjaygupta

KOLs in healthcare

KOLs are particularly important in healthcare, to offer an example, in a KOLs study by Clinckemaillie et al. in 2011, 850 Healthcare providers (HCPs) outside of the United States were asked how they decide which brand of medication to prescribe. 40% out of the 850 participants said they based their decision on the prominence of specific pieces of research available about the drugs they prescribe. In other words, in the case of a doctor, the opinions of prominent peers/researchers ( KOLs ) are taken into account to recommend a treatment plan to a patient.

KOLs Identification: How to find KOLs

A Key Opinion Leader can sway minds.
Using the KOLs website, you can compare the level of influence of any two KOLs for any concept . Use the search bar at the top of any page on this website, and then filter the KOLs by subconcepts (known-fow) and location (city or country).

To get a more personalized (but still free) KOLs list, please email , and in less than 2 hours, we will send you the list of the most influential KOLs that match your targeting criteria (location, concepts, subconcepts).

How many individuals are in KOLs database?

The Key Opinion Leaders' database, or KOLs database for short, has coverage for more than 50 million individuals in over 170 countries (please see the FAQs for more details).

Are KOLs mappings free?

Yes, access to KOLs mappings and the entire KOLs database is entirely free of charge . You can run unlimited queries and use as many filters (city, country, sub-concepts, organizations and more) as you need. There is no longer a need to pay hefty fees to providers of KOL mappings.

Where is KOLs located?

We currently operate two locations that serve customers all around the world:

Key Opinion Leaders2025 NW 102 Avenue, Suite 111, Doral, FL 33172, United States Phone: +1 (786) 372-6727
Key Opinion Leaders351 Paseo Nuevo 2nd Floor #1007 Santa Barbara CA 93101 United States Phone: +1 (805) 259-3231

Are there other organizations that provide alternatives to KOLs?

Yes, there are other companies/services that provide key opinion leaders' insights, some that we know of are (in no particular order):

Kol LLC12 Cassway Rd, Woodbridge, CT 06525 Phone: 203.393.2924
KOL Limited3.22 Qwest (International House, 1100 Great West Rd, Brentford TW8 0GP, United Kingdom Phone: +442033710101
Kendle HealthcareBarley Mow Centre, 10 Barley Mow Passage, Chiswick, London W4 4PH, United Kingdom Phone: +442084873726
KOLUniversity of Zürich, Rämistrasse 71, 8006 Zürich, Switzerland
Kolsquare124 Rue Réaumur, 75002 Paris, France Phone: +33184798275


Get a free KOL report:


KOLs Profiling: What are "Key Opinion Leader insights"?

KOLs can influence audiences on different topics or concepts; for example, a KOL in sports may not be influential in music. Even within the same discipline, for example, sports: A KOL in baseball may not be influential for soccer.

Generally speaking, you may want to understand which specific concepts a KOL has an influence on and quantify their level of influence (for that particular concept) before investing time and resources in nurturing the relationship with the KOL. This process is known as KOL profiling.

Key opinion leader insights are a set of concepts that would accurately describe and provide a deep understanding of a KOL.

In layman's terms, the insights for a thought leader would be a set of concepts that describe accurately what this key opinion leader knows about or has influence for.

The following is an example of key opinion leader insights for a prominent scientist (this is an actual example derived by the KOLs platform):

Key opinion leader insights example, use the search bar to find the best KOL for your interests

Key opinion leader jobs / KOLs jobs / KOLs careers

From time to time, we allow posting job/engagement/career opportunities in the KOLs Careers section. If you are interested in posting a KOLs-related job or a key opinion leader career/engagement opportunity, please contact us using the contact us form. Users must comply with all applicable laws, the terms of use, and all posted site rules. Postings are subject to review and approval before they can go live.


KOLs Frequently Asked Questions


What is a key opinion former?

Key opinion former is often used interchangeably with "key opinion leader" or "KOL". Please see the " What is a KOL ?" above.

Why are thought leaders and digital opinion leaders influential in Healthcare?

It is the case because doctors, patients, advocacy groups, and sometimes even regulatory agencies consider the leader opinion while making decisions.

Could there be conflicts of interest?

In our opinion key opinion leaders can hold leadership roles and manage conflicts of interest (COIs) with integrity.

What is the meaning of the numeric influence score of a Key Opinion Leader for a concept?

The Key Opinion Leader concept score, or KOL concept score for short, is a deterministic, quantifiable, and verifiable measure of a person's level of influence (for a specific concept) on the scientific/academic community. It is a measure of that person's level of contextual influence for that specific concept.

How are the KOL concept scores calculated?

The Key Opinion Leader concept scores (KOL concept scores) are calculated using our proprietary technology and artificial intelligence operating over a set of over 100 million publications.

How many individuals are in a KOLs database?

The Key Opinion Leaders' database has coverage for more than 50 million individuals in over 170 countries.

How many concepts are mapped to KOLs?

You can access sorted KOL mappings for over 3 trillion concepts (3,000,000,000,000+ concepts).

How can I get a copy of the KOLs database?

To get a copy of the KOLs database please contact us by clicking on the "Contact us" link at the bottom of any page in Key Opinion Leaders' website.

How can I find oncology key opinion leaders?

For illustration purposes, we have prepared a guide that showcases how to find key opinion leaders in oncology. Please see the guide " How to find Key Opinion Leaders in Oncology ."

This guide is just an illustrative example. You can use the Key Opinion Leaders website similarly to identify KOLs in any other area of knowledge. This service is completely free of charge and publicly accessible .

Last updated: September 16, 2022



Desmoid Tumor / Key Opinion Leaders / -- A Desmoid Tumor is a noncancerous tumor that grows from the fibroblast cells in connective tissue. Also known as aggressive fibromatosis, it is a rare condition that does not usually impact lifespan but can cause debilitating symptoms in some patients. This noncancerous tumor is unable to metastasize, meaning it does not cause secondary growth in new parts of the body. Despite its inability to undergo metastasis, a Desmoid Tumor can grow anywhere; however, it tends to inhabit some locations more than others, such as the shoulders, abdomen, upper arms, and thighs. Furthermore,...


Pancoast Tumor / Key Opinion Leaders / -- A Pancoast Tumor is a tumor of the apex of the lung, named after radiologist Henry Pancoast. A Pancoast Tumor is defined primarily by its location at the very top of either lung. Also, most of these tumors are a form of non-small cell lung cancer. Pancoast Tumors are particularly difficult to diagnose and treat due to their location. The Pancoast Tumor often grows near and around blood vessels, nerves, lymph nodes, ribs, and the spine. When the tumor compresses and invades these areas, it creates health problems outside the usual symptoms of lung cancer. While Pancoast Tumors only...


Macromastia: An Overview / Key Opinion Leaders / -- Macromastia is a rare condition that causes an abnormal enlargement of the breast tissue . Sometimes referred to as either hypertrophy or breast hypertrophy , this condition can have a huge impact on the lives of those affected by it. While the precise cause of macromastia is still as yet known, there are a few possible triggers that have been identified. Within the scientific community, there are several key researchers that are exploring this relatively uncharted condition with the hope of understanding more about why it occurs and how to treat it. Read on to discover everything you...


These Are The Top 5 Key Opinion Leaders (Kols) On Abortion Legislation / Key Opinion Leaders / -- As Roe v Wade celebrates its 49th anniversary, the overturning of the ruling puts abortion at the forefront of American politics. Many people are influential when it comes to abortion legislation and shaping the way the subject of abortion is perceived in societies across the globe. The firm KOLs (Key Opinion Leaders) analyzed the impact of the top researchers and academics in the field and published the list of the five most influential KOLs on the topics of Abortion _and_ Legislation. These key opinion leaders (KOLs) significantly impact how society and academic...


8 Inspiring Lgbtqia+ Kols Making The Biggest Impact / Key Opinion Leaders / -- Influencing the public and gaining their respect is something that few have achieved in history, so when they do, it is a big deal for both that person and the community itself. For the scientific and LGBTQIA+ communities, the impact of 8 particular professionals ' contributions is helping to promote diversity more than ever before. From doctors to researchers, these professionals have made the Key Opinion Leaders (KOLs) list due to their reputations, skills, achievements, and dedication to their fields - they have now gained the expert status they rightfully deserve. To...


Javascript Compilers In Academic Circles: The Most Cited Researchers And Organizations (Javascript Kols) / Key Opinion Leaders / -- If you are familiar with Javascript or use it in some capacity, you probably heard names like: \- Brendan Eich, creator of JavaScript, co-founder of the Mozilla Foundation \- Douglas Crockford - Author of "JavaScript: The Good Parts" and ex-Yahoo! \- Anders Hejlsberg, creator of TypeScript All these names certainly deserve the recognition that is attached to them. They would be what we could call "Javascript celebs." There is another group of influential people in the Javascript world, they might not be the creators of the language or best-selling authors, but they create an immense...



KOLs Events

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The 2022 Global Ophthalmology Summit is an event organized by The American Academy of Ophthalmology taking place in Park City, UT that will gather eye care professionals from all over the world with the purpose of enhancing global eye care. The event is open to ophthalmologists, optometrists, public health professional and any professional involved with eye care.


Sheraton Park City Hotel 1895 Sidewinder Dr. DetroPark City UT USA 84060
2022 Global Ophthalmology Summit


The 2022 ASHE Annual Conference is an event organized by ASHE that will gather thousands of health care facility and engineering professionals for networking, learning from one another and finding new solutions to challenges. It will prepare the ideal environment to connect about future trends in health care.


Boston Convention and Exhibition Center 415 Summer St Boston MA USA 02210
2022 Ashe Annual Conference


HIMSS European Health Conference & Exhibition 2022 is a healthcare conference organized by HIMSS that attracts a wide variety of professionals in the global healh ecosystem. It provides lively networking events, 60+ live sessions and an exhibition with innovative health tech solutions.


Messukeskus Convention Centre - Southern Entrance Messuaukio 1 Helsinki Finland 00520
Himss European Health Conference & Exhibition 2022


Mental Health America's 2022 Annual Conference is organized by Menthal Health America (MHA) and will be presented in a hybrid format with an in-person event in Washington, DC and live-streamed for remote attendees. This conference is focused on important and emergent mental health issues and is geared towards providers, family members, advocates, consumers and affiliates.


Hyatt Regency Washington On Capitol Hill 400 New Jersey Ave NW Washington DC USA 20001
Mental Health Americas 2022 Annual Conference



KOLs Careers

Medical Affairs Success Executive And B2b Sales About Key Opinion Leaders (KOLs) As the largest KOLs database with a coverage for more than 50 million KOLs in over 170 countries, Key Opinion Leaders...



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