Executives/Center for Internet Security CEO
John M. Gilligan, CEO of Center for Internet Security

Who is the CEO of Center for Internet Security in 2026?

John M. Gilligan is the Chief Executive Officer and President of Center for Internet Security. John has held the CEO seat since 2018, and was previously SVP at SRA, a CSRA company.

Updated September 24, 2026
Time in seat
8 years
CEO since 2018
Years at company
10 years
Joined Center for Internet Security March 2016
Career span
25 years
First recorded role January 2001
Summary
  • John M. Gilligan rose through Center for Internet Security: Executive Chairman from March 2016, before taking the CEO seat in 2018.
  • Alongside Center for Internet Security, John M. Gilligan serves as President at Gilligan Group, Inc. since May 2008.
  • John M. Gilligan was President and COO at Schafer Corporation from June 2013 to May 2017.

Current company

Center for Internet Security

Center for Internet Security is a nonprofit organization.

Computer and Network SecurityHeadquartered in East GreenbushFounded 2000Private company

Source: Wikipedia

Career and education

John M. Gilligan joined Center for Internet Security in March 2016 and has been CEO since 2018. Before Center for Internet Security, John was SVP at SRA, a CSRA company from January 2005 until December 2008.

Career

  1. Center for Internet Security2016 to present
    • President and Chief Executive OfficerOctober 2018 to present
    • Executive ChairmanMarch 2016 to present
  2. Gilligan Group, Inc.2008 to present
    • President
  3. Isobar2012 to 2024
    • Board of Directors
  4. Schafer Corporation2011 to 2017
    • President and COOJune 2013 to May 2017
    • Member Board of DirectorsJune 2011 to May 2017
  5. HDT Global (a Metalmark Capital Company)2007 to 2014
    • Chairman of the Board of Directors
  6. SRA, a CSRA company2005 to 2008
    • SVP
  7. United States Air Force2001 to 2005
    • CIO

Sources: LinkedIn profile

Education

Virginia Polytechnic Institute and State University - Pamplin College of Business, Master of Business Administration (MBA)Case Western Reserve University, MSE, Computer EngineeringDuquesne University, Bachelor of Arts (BA), MathematicsSource

Decision makers by function

20+ decision makers at Center for Internet Security in Unify, vice president level and above. Choose a function to see who leads it.

Decision maker preview

Top decision makers at Center for Internet Security

Vice president level and above, most senior first
Joy HaysSenior Vice President, Marketing and Communications · USA@cisecurity.org
Carlos P KizzeeSenior Vice President, MS-ISAC Strategy and Plans · USA@cisecurity.org
Stephen ThomasSVP, Sales and Business Services · USA@cisecurity.org
Craig LevinVice President of Business Finance · USA@cisecurity.org
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Leadership team at Center for Internet Security

John M. Gilligan leads a leadership team of 12 published executives.

Most senior 5 of 12

NameTitleIn seat since
John M. GilliganPresident and Chief Executive Officer2018
Albert SzesnatChief Financial OfficerNot stated
Safaa KhairallaChief Operating OfficerNot stated
Lisa GreeneGeneral Counsel and Chief Legal OfficerNot stated
Angelo MarcotullioChief Information OfficerNot stated

Sources: Center for Internet Security leadership page

Frequently asked questions

Who is the CEO of Center for Internet Security?

John M. Gilligan is the Chief Executive Officer and President of Center for Internet Security. John has held the CEO seat since 2018, and was previously SVP at SRA, a CSRA company.

When did John M. Gilligan become CEO of Center for Internet Security?

John M. Gilligan has been CEO of Center for Internet Security since 2018, according to LinkedIn profile.

What did John M. Gilligan do before Center for Internet Security?

John M. Gilligan was SVP at SRA, a CSRA company from January 2005 until December 2008, according to LinkedIn profile.

How long has John M. Gilligan been CEO of Center for Internet Security?

John M. Gilligan has been CEO of Center for Internet Security for 8 years, since 2018.

Who else leads Center for Internet Security?

Albert Szesnat (Chief Financial Officer), Safaa Khairalla (Chief Operating Officer), Lisa Greene (General Counsel and Chief Legal Officer), Angelo Marcotullio (Chief Information Officer), and 7 more. Source: Center for Internet Security leadership page.

Reach Center for Internet Security's decision makers

20+ leaders at vice president level and above, with verified work emails and phone numbers in Unify.

Methodology

The seat holder is identified in Unify's professional profile dataset, then confirmed against the company's published leadership page, its SEC filings, and Wikipedia before publication. Career and education rows carry the public document they were taken from. Leadership team membership follows the company's own leadership page; in-seat dates come from filings where available and otherwise from the profile record. Company figures are read from the Unify headcount page for the same company and are profile coverage measures, never company-reported workforce totals. The employee preview lists vice president and senior vice president level profiles by department. No personal contact details are published.

Identity confirmed against Wikipedia, Center for Internet Security. Last verified: September 24, 2026.