Security, Reimagined!

We are on a mission to empower organizations to eliminate the world’s exposure to cyber threats

Our Values

Circle’s breakthrough security API unifies the solutions for identity and data security into one architecture and empowers organizations to secure their identity, data and privacy in their applications. Our culture and leadership principles motivate us to carry this mission forward with conviction and commitment.

Champion’s Mindset

We dream big, reimagine the possibilities with a growth mindset, and strive to deliver consistent excellence in our approach and outcomes
Champion's Mindset

Integrity & Trust

We act with integrity guided by an uncompromising moral compass, and we place trust in each other to collectively propel the organization forward to achieve shared goals
Integrity and Trust

Respect for Individuality

We fiercely respect individual differences while operating as a unified team which draws on the strengths of diverse talents
Respect for Individuality

Customer Obsession

We are passionate about solving our customer problems and use that as the singular guiding post for delivering impact to all our stakeholders
Customer Obsession

Learning Pursuit

We embrace change and commit to learning and adapting. We own up to our mistakes, learn from them and learn from each other
Learning Pursuit

Empathetic Culture

We embody empathy and this is the cornerstone of our organizational culture
Empathetic Culture

Circle Leadership

Executive Team
Board
Advisors
Sara Duryea
Founder & CEO
Sara Duryea
Founder & CEO

Sara is the original inventor and patent holder of Circle’s groundbreaking threat elimination technology. She is a visionary entrepreneur with extensive experience serving on the Boards of several non-profits. Most recently, she was Chair of the Board of Directors of Mission Dolores Academy, a school that addresses achievement equity by providing equal access to first-tier whole child education. Sara was also President of Circolo Villa Taverna and the San Francisco Opera Guild. She has chaired over 65 major fundraising events for various San Francisco Bay Area organizations working in education, healthcare and the arts, all but one exceeding projected profit.

Taamir Ransome
Chief Technology Officer and EVP of Technology and Research
Taamir Ransome
Chief Technology Officer and EVP of Technology and Research

Taamir Ransome is a retired Special Operations Army veteran who has served at the highest levels of the military. His distinguished career includes work with the National Mission Force and collaborations with the Department of Defense (DoD), the Department of Justice (DoJ), and the Department of Energy (DoE) on the country’s most sensitive projects.

Transitioning from the military, Taamir has become a proficient data scientist, bringing analytical rigor and strategic insights to his work. He holds multiple cybersecurity certifications, showcasing his expertise in protecting and securing digital assets. He was named "Top 100 Innovators and Entrepreneurs" by the The Official Top 100 magazine.

Taamir's unique background combines the discipline and leadership of military operations with advanced technical skills in data science and cybersecurity. His experience in high-stakes environments has equipped him with a keen ability to analyze complex data, develop robust security protocols, and implement innovative solutions. Taamir's dedication to continuous learning and his commitment to excellence make him an invaluable asset in the field of cybersecurity and data science.

Michael O’Donnell
Executive Strategic Advisor
Michael O’Donnell
Executive Strategic Advisor

Michael is an experienced, growth-oriented CEO with a proven track record for
successfully transforming and building a broad range of technology companies.
Over the course of his 25-year career he has repeatedly demonstrated the ability to
galvanize teams, deepen existing customer relationships and attract new customers
and partners, and drive successful exits, including a NASDAQ IPO and four
acquisitions by public and private companies, respectively. He has worked in
software, hardware, content, cloud computing and robotics, with companies
targeting a variety of vertical markets including healthcare, entertainment, sports,
gaming and hospitality.

Most recently Michael led the transformation of digital health publisher HealthiNation, tripling revenue
and turning a 40% loss into a 30% EBITDA profit. He then initiated a partnership discussion with
$15B+ market cap GoodRx (NASDAQ: GDRX), leading to an acquisition that delivered a 6x return on
capital. Michael’s other successful exits include the sale of a video data analytics company to Citrix
(NASDAQ: CTXS) and the sale of a social media technology company to Cisco (NASDAQ: CSCO).
An unparalleled relationship developer, Michael has built a valuable network of C-level executives at
such leading technology companies as Adobe, Amazon, Apple, Cisco, Comcast, Google, META,
Microsoft, Nvidia, Oracle, Salesforce and ZOOM, well as such diverse enterprises as Warner Bros
Discovery, Healthcare Corporation of America (HCA), the National Football League, Major League
Baseball and The PGA Tour.

Michael’s broad range of professional achievements include pioneering one of the Internet's first
successful subscription models, generating significant digital ad revenue from major brands in the
pharmaceutical, financial services, automotive and CPG industries, and selling large enterprise software
systems to F500 companies. He was named a “Top 100 Healthcare Leader” by International Forum on
Advancements in Healthcare, was a founding board member of the Online Publishers Association, and
has become an industry thought leader who speaks at such major industry conferences as SXSW.

He holds a B.A. from The University of California, Berkeley, where he was also a four-year student-
athlete as a member of the Varsity Football Team. Michael is also a graduate of Bellarmine College.

Gene Allen
VP of Engineering
Gene Allen
VP of Engineering

Gene is a seasoned product engineering executive with over 25 years of experience architecting cybersecurity software. He has held engineering leadership roles with McAfee, SolARC, BBS Technologies, NetIQ and other major software players. Among his many achievements, Gene has designed a proprietary P2P secure messaging and collaboration system; launched a major company’s flagship security product; grown a Rapid Development Team 15x while shipping 15 shrink-wrap products; created several popular lead generation tools; and architected event management software later purchased by Microsoft for $275 million. Gene brings to market innovative cybersecurity, data protection, identity security, secure collaboration and privacy preservation products.

Sara Duryea
Founder & CEO
Sara Duryea
Founder & CEO

Sara is the original inventor and patent holder of Circle’s groundbreaking threat elimination technology. She is a visionary entrepreneur with extensive experience serving on the Boards of several non-profits. Most recently, she was Chair of the Board of Directors of Mission Dolores Academy, a school that addresses achievement equity by providing equal access to first-tier whole child education. Sara was also President of Circolo Villa Taverna and the San Francisco Opera Guild. She has chaired over 65 major fundraising events for various San Francisco Bay Area organizations working in education, healthcare and the arts, all but one exceeding projected profit.

David Chamberlain
Board Chair
David Chamberlain
Board Chair

David Chamberlain has over 15 years of CEO experience, having led three successful NYSE-listed companies — Stride Rite, Genesco and Shaklee. He substantially increased shareholder value at each firm. He is recognized for his ability to rapidly change failed cultures, modify behavior and improve results. During his career, he bought and successfully integrated businesses, sold underperforming operations, as well as repositioned and rebuilt nationally recognized brands.

Mike Bassignani
Board Member
Mike Bassignani
Board Member

Industry Advisory Council
Timothy Allan Simon, Esq. (Energy & Utilities)
Former CA Public Utilities Commissioner
Timothy Allan Simon, Esq. (Energy & Utilities)
Former CA Public Utilities Commissioner

Timothy Alan Simon, Esq., Commissioner Emeritus, was appointed to the California Public Utilities Commission (CPUC) by Governor Arnold Schwarzenegger on February 15, 2007 ending his term on December 31, 2012. Prior to this appointment, he served as Appointments Secretary in the Office of the Governor – the first African American in California history to hold this post. As a CPUC Commissioner, Simon served on the Board of Directors of the University of California at Berkeley, Berkeley Energy Collaborative (BERC) and the Energy Imbalance Market (EIM) Regional Taskforce, Chairman of the National Association of Regulatory Utility Commissioners Gas Committee, Chairman of the Liquefied Natural Gas Partnership between NARUC and the U.S. Department of Energy and Vice Chairman of the Utility Marketplace Access Sub-Committee, a sub-committee concentrated on supplier and workforce diversity in the utility industry, Board Member of the California Green Jobs Workforce Development Board, and assigned Commissioner to the CPUC Low Income Oversight Board. Simon also was appointed by two  Department of Energy Secretaries as a member of the National Petroleum Council serving on the Coordinating Subcommittee, which produced the book, Prudent Development: Realizing the Potential of North America’s Oil and Gas Resources.

Simon also served as an Adjunct Professor of Law at U.C. Hastings College of the Law and Golden Gate University School of Law where he taught Securities Regulations and as an Advisor in the School of U.S. Legal Studies on International Securities Regulations. Prior to public service, Simon was in-house counsel and Chief Compliance Officer advising at major financial institutions including Bank of America, Robertson Stephens and Wells Fargo, specializing in securities, banking and complex financial products.

In 2013, Simon created TAS STRATEGIES and serves as an attorney and consultant on high stake areas that include energy, utilities, critical infrastructure, supplier diversity, transportation, financial services, and broadband projects. Simon has developed a global client base and performs public speaking engagement on energy, financial services and diversity policies. He is co-founder of the National Utilities Diversity Council and has published articles for the National Regulatory Research Institute “The Role of Natural Gas in California’s Climate Policy” and the Green California Community Colleges Summit – “A Discussion on Innovations in Technology Policy and Practice”.

In February 2019, Simon was elected as Chairman of the Board of Directors for the California Black Chamber of Commerce. He was also appointed to the University of San Francisco (USF) Board of Trustees in June of 2019. Simon also serves on the North American Energy Standards Board Advisory Council. He also serves as a member of the American Bar Association and on the National Board of Directors for the American Association of Blacks in Energy (AABE).

Simon received a Bachelor’s degree in Economics from the University of San Francisco, (Distinguished Alumni) and a Juris Doctor from the University of California Hastings College of the Law. Simon also takes pride in his civic duties as a member of the following associations: National Bar Association, American Bar Association, California Bar Association, San Francisco Bar Association, the Federal Energy Bar Association, Power Association of Northern California, and The National Board of Directors of the American Association of Blacks in Energy. He also serves in several leadership capacities as a Board Member of the Saint Thomas More Society of San Francisco, Board of Trustees Member for Saint Ignatius College Preparatory (Alumni), Member Sigma Pi Phi, Beta Upsilon Boulé, Board of Trustees Member for SFJAZZ, and is a Lifetime Member of the NAACP. In addition, he serves as a Board Member for Aemetis and Charah Solutions, two publicly traded companies. Most recently, Simon has also become a Strategic Advisor for Inter-Atlantic Energy Capital Ventures.

John Micek
Board Member
John Micek
Board Member

John Micek is a Managing Partner of Third Leaf Partners.  He is also the Co-Founder and Chief Executive Officer of Red Stitch Wine, a critically-acclaimed Napa Valley boutique winery that he founded in 2008 with Dave Roberts and Rich Aurilia.  His operational and investor relations experience has grown out of a 17 year career in the hedge fund industry where most recently, John was a Partner and held roles as COO and Head of Investor Relations and Business Development at Criterion Capital Management.

Timothy Allan Simon, Esq. (Energy & Utilities)
Former CA Public Utilities Commissioner
Timothy Allan Simon, Esq. (Energy & Utilities)
Former CA Public Utilities Commissioner

Timothy Alan Simon, Esq., Commissioner Emeritus, was appointed to the California Public Utilities Commission (CPUC) by Governor Arnold Schwarzenegger on February 15, 2007 ending his term on December 31, 2012. Prior to this appointment, he served as Appointments Secretary in the Office of the Governor – the first African American in California history to hold this post. As a CPUC Commissioner, Simon served on the Board of Directors of the University of California at Berkeley, Berkeley Energy Collaborative (BERC) and the Energy Imbalance Market (EIM) Regional Taskforce, Chairman of the National Association of Regulatory Utility Commissioners Gas Committee, Chairman of the Liquefied Natural Gas Partnership between NARUC and the U.S. Department of Energy and Vice Chairman of the Utility Marketplace Access Sub-Committee, a sub-committee concentrated on supplier and workforce diversity in the utility industry, Board Member of the California Green Jobs Workforce Development Board, and assigned Commissioner to the CPUC Low Income Oversight Board. Simon also was appointed by two  Department of Energy Secretaries as a member of the National Petroleum Council serving on the Coordinating Subcommittee, which produced the book, Prudent Development: Realizing the Potential of North America’s Oil and Gas Resources.

Simon also served as an Adjunct Professor of Law at U.C. Hastings College of the Law and Golden Gate University School of Law where he taught Securities Regulations and as an Advisor in the School of U.S. Legal Studies on International Securities Regulations. Prior to public service, Simon was in-house counsel and Chief Compliance Officer advising at major financial institutions including Bank of America, Robertson Stephens and Wells Fargo, specializing in securities, banking and complex financial products.

In 2013, Simon created TAS STRATEGIES and serves as an attorney and consultant on high stake areas that include energy, utilities, critical infrastructure, supplier diversity, transportation, financial services, and broadband projects. Simon has developed a global client base and performs public speaking engagement on energy, financial services and diversity policies. He is co-founder of the National Utilities Diversity Council and has published articles for the National Regulatory Research Institute “The Role of Natural Gas in California’s Climate Policy” and the Green California Community Colleges Summit – “A Discussion on Innovations in Technology Policy and Practice”.

In February 2019, Simon was elected as Chairman of the Board of Directors for the California Black Chamber of Commerce. He was also appointed to the University of San Francisco (USF) Board of Trustees in June of 2019. Simon also serves on the North American Energy Standards Board Advisory Council. He also serves as a member of the American Bar Association and on the National Board of Directors for the American Association of Blacks in Energy (AABE).

Simon received a Bachelor’s degree in Economics from the University of San Francisco, (Distinguished Alumni) and a Juris Doctor from the University of California Hastings College of the Law. Simon also takes pride in his civic duties as a member of the following associations: National Bar Association, American Bar Association, California Bar Association, San Francisco Bar Association, the Federal Energy Bar Association, Power Association of Northern California, and The National Board of Directors of the American Association of Blacks in Energy. He also serves in several leadership capacities as a Board Member of the Saint Thomas More Society of San Francisco, Board of Trustees Member for Saint Ignatius College Preparatory (Alumni), Member Sigma Pi Phi, Beta Upsilon Boulé, Board of Trustees Member for SFJAZZ, and is a Lifetime Member of the NAACP. In addition, he serves as a Board Member for Aemetis and Charah Solutions, two publicly traded companies. Most recently, Simon has also become a Strategic Advisor for Inter-Atlantic Energy Capital Ventures.


Partners

Circle’s Partner Program is the fastest way to help your customers build breakthrough security protecting identity, data, and privacy in their application environments.

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Careers

Come join us on this transformative journey. We are hiring!

ENGINEERING, PRODUCT, SALES ENGINEERING, CUSTOMER SUCCESS, MARKETING, SALES.

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