About TeleSign | TeleSign


TeleSign connects and protects online experiences with sophisticated customer identity and engagement solutions. Through APIs that deliver user verification, data insights, and communications we solve today’s unique customer challenges by bridging your business to the complex world of global telecommunications.


TeleSign connects and protects online experiences with sophisticated customer identity and engagement solutions. Through APIs that deliver user verification, data insights, and communications we solve today’s unique customer challenges by bridging your business to the complex world of global telecommunications.


Ryan Disraeli

Ryan Disraeli is a co-founder of TeleSign and was instrumental in pioneering mobile phone-based two-factor authentication, a security service that today protects billions of online accounts around the world. Ryan currently oversees strategic company operations and key initiatives, providing industry expertise and consultative support to the executive team and board of directors.

Disraeli is a frequent speaker in the area of online fraud and authentication and regularly provides commentary in the industry. In 2017 Disraeli was named to the “Forbes 30 Under 30 List” and in 2018 was named the USC Alumni Entrepreneur of the Year.

Tim Weerasiri

Weerasiri is the CFO of TeleSign, he also oversees legal and security. Prior to joining TeleSign, Tim held finance leadership positions at Enervee, Victorious and Riot Games. In his role, Tim aligns financial metrics with business strategy to drive growth. Outside of the office Tim can be found scuba diving, skiing, drinking wine, and reading extensively.

Stacy Stubblefield

Stubblefield co-founded TeleSign in 2005 and today helps to drive TeleSign's product strategy and identify opportunities for innovation--ensuring that TeleSign delivers groundbreaking technology that best addresses market needs. As part of TeleSign's founding team, she was instrumental in conceptualizing and developed its platform and patented technology. While developing TeleSign's technology, she also oversaw an engineering team at an internet incubator that launched several fast-growing web properties. She remains an active consultant, advising internet start-ups and consumer product sites and is a frequent speaker at industry events, including Mobile World Congress and Mobile Computing Summit.

Wei Lin

Wei Lin oversees TeleSign Engineering organization and is responsible for product development. Lin is a college lecturer and a veteran of software industry and held various leadership roles at Symantec, CAE and Leco Instrument. Prior joining TeleSign, she taught computer science at the Computer Science Department of California Polytechnic State University Pomona. Previously, Lin spent 16 years at Symantec where she was a Sr Director of Engineering responsible for development of various Norton security products, Norton eCommerce, and core security solutions included in both Norton and Symantec enterprise products.

Paul Stovall

Stovall is responsible for Americas’ sales, global channel sales and global customer success/client services teams at TeleSign. Prior to joining TeleSign, Paul worked for more than 20 years as an Enterprise Sales Executive at several startups, most recently as the Sr. Director of Sales at Seattle based startup Usermind.

Pierre Demarche

Demarche oversees Product Management and Marketing. Coming from BICS, he was part of the M&A team that led the acquisition process of TeleSign. Following the transaction, he was then put in charge of post acquisition strategy. In his position at TeleSign, Demarche is also leading the implementation of the synergies between BICS and TeleSign and further optimization of the transaction. Other responsibilities in his current role also include strategy and business development.

Yoon Ahn

Yoon is responsible for keeping all network systems running smoothly and efficiently in order to provide clients with a reliable and consistent experience. He has over 16 years of experience in providing reliable operations in several industries, from supporting and managing small to large organizations.

Yoon is an ever-evolving technologist at heart, who enjoys tinkering with and learning about the latest technology and gadgets. When he is not working, he can be found on the golf course.

Mac Kern

Kern oversees all routing and pricing analysis for TeleSign. Prior to joining TeleSign, he was the VP, Commercial Strategy at Surf Air, responsible for optimizing route cost and pricing strategy of the airline.  Prior to Surf Air, Mac worked at Virgin America, focused on Revenue Management.

Ognjen Simic

Simic leads TeleSign’s global customer support effort and oversees all Belgrade Office Operations. Before joining TeleSign, he was the Chief Strategy Officer at Saga d.o.o. Belgrade.

Ashley Lundquist

Ashley is a data-driven leader that enjoys building unified cultures that cultivate individual and organizational growth and achievement. She has extensive experience leading the visioneering, development, and implementation of innovative talent acquisition and people operations programs in growth-oriented, scaling environments. Ashley previously ran talent and people operations teams at several software companies including Cloudvirga, Drip, Leadpages, and Houzz.

Chairman of the Board

Daniel Kurgan

Kurgan has been Chief Executive Officer of Belgacom International Carrier Services (BICS) since March 2, 2007 and served as its Chief Operating Officer since July 1, 2006. He started his career as Contracts Manager at SABCA (biggest Belgian aerospace company, subsidiary of French Group Dassault), where he negotiated and managed major industrial sales, subcontracting and purchase contracts with customers like Boeing, Airbus, Aerospatiale (EADS), Asian governments and suppliers like GEC Marconi, Litton. Kurgan joined Belgacom's Carrier Division at the start of the carrier commercial operations in January 1997, where he held several positions including International Account Manager, Head of International Relations & Sales, Sales Director (domestic and international wholesale) and Vice President of International Wholesale, in charge of Sales & Marketing, Buying & LCR and Customer Service and Network. Since 2005, Kurgan served as Vice President of Commercial of Belgacom ICS and contributed to the spin-off of Belgacom's international carrier business. He is a graduate from Solvay Business School of the University of Brussels.


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