The PubNub Leadership Team


Leadership Team

  • Todd Greene
    Founder and CEO

    As an entrepreneur who has founded and successfully sold companies across the software spectrum, Todd shapes PubNub’s vision of powering apps that bring people together, virtually. Prior to PubNub, Todd was CEO of Loyalize, where he helped build the first-ever social TV app and successfully led their acquisition by Function(x) (FNCX). Todd also founded CascadeWorks and spearheaded their sale to Elance. He has also held prominent roles at GE, SGI, Quantum, Price Waterhouse, and NetDynamics—where he assisted in creating a truly game-changing product: the first application server built for the internet.

  • Stephen Blum
    Founder and CTO

    Stephen's vision and strong technical chops drove the initial architecture of PubNub. He built the core engine of PubNub, which has allowed the company to successfully scale to power some of the largest real-time deployments in the world. Stephen has been a successful software entrepreneur his whole life. He founded his first company, LTSun, at age 17, and joined Microsoft after its acquisition. Additionally, Stephen was the chief architect for TrustedOpinion.com, a 50-language social recommendations site that grew to over 1 million users across over 100 countries.

  • Russ Lemelin
    Chief Financial Officer

    Russ has over 10 years of experience working with venture-backed SaaS companies. He has successfully managed and advised companies through all stages of the start-up life cycle, including acquisitions. Prior to PubNub, Russ was the CFO of Extole, the CEO and CFO at TravelMuse, and the interim CEO and CFO of SideStep. He joined SideStep at the idea stage and successfully built them into one of the internet’s leading travel sites. Russ began his seasoned financial career as a consultant with Ernst & Young’s and with an MBA and JD from the University of San Diego.

  • Barbara Burlington
    VP, Marketing

    With over 25 years of marketing experience, Barbara has focused on bringing category-creating technologies to market. At Exodus Communications, Inc. she led global brand and awareness efforts as the company grew to become the world’s largest web hosting provider. At Message Systems she re-branded the company as SparkPost with the launch of its new SaaS email infrastructure services, growing to deliver over 25% of the world’s legitimate email. Most recently she led Marketing at Grokker, Inc., taking it from new entrant in the HR benefits space to recognition as one of the top wellbeing brands.

  • Jonas Gray
    VP, Business Development

    Jonas brings over 20 years of experience in business development, marketing, and technology to PubNub. Prior to joining the team, Jonas served as SVP, Global Business Development and Brand Partnerships at UberMedia (part of Idealab). In that role, he created partnerships with numerous Fortune 500 clients. He also served as SVP of Marketing at Big Stage Entertainment. Earlier in his career, he helped build the first online DVD retailer (DVD Express) and the first online music company (N2K), which completed a successful IPO.

  • Phani Pandrangi
    VP, Product

    Phani is a product leader with zero-to-one as well as scaling experiences in both developer-oriented platforms and business-oriented solutions. Products he has owned, launched and managed span enterprise middleware, cloud-based mobile and IoT backend platforms (PaaS), and IoT solutions (SaaS). He comes to PubNub with 25 years of experience in product management and engineering. Prior to PubNub, he was the Chief Product Officer at Kii and before that, he worked in product and engineering roles in multiple organizations. Phani lives in the San Francisco Bay Area and holds a Masters in Computer Science from Oregon State University, and an MBA from University of California (Berkeley).

  • Scott Hill
    VP, Engineering

    Scott is a seasoned engineering leader, with over twenty years of experience leading engineering teams in a variety of environments. He has a wealth of experience creating strong Agile/Scrum development teams and empowering them to create large-scale, web and cloud-based platforms. Scott honed his technical skills as an architect at companies such as Signio (acquired by VeriSign) and PayPal. Prior to joining PubNub, he was the Head of Engineering for Data Security at Micro Focus. A native of the San Francisco Bay Area, Scott lives in Belmont, California with his wife and daughter.

  • James Hamilton
    VP, Operations and Controller

    With over 20 years of diverse financial and operations leadership experience, James thrives in helping structure companies for growth. He began his career at University of Wisconsin–Madison, leading a finance team at Genetics Computer Group (now part of BIOVIA) and as a management consultant at PricewaterhouseCoopers. At 1WorldSync, he helped scale operations across Europe and South America, and at Pacific Maritime Association he improved financial operations across more than 40 entities. Outside of work, James spends his weekends hiking the Marin headlands with his wife, dog, and two kids and honors his Wisconsin roots by hanging around the hockey rink.

  • Helena Teav
    General Counsel

    Helena has represented established technology companies for many years, resolving international and domestic issues relating to commercial agreements and technology transactions. She is an experienced negotiator who is passionate about drafting technology contracts and enjoys working on corporate matters, licensing, privacy and data security, employment law, and compliance. She began her career over two decades ago at Adobe Systems. Prior to PubNub, she worked at Citrix Systems, was general counsel at a financial services company, and worked in private practice. Helena holds a JD from UC-Hastings College of the Law.

Our Board

Kevin Talbot
Board Member, Relay Ventures

Kevin is a Co-founder and Managing Partner at Relay Ventures. Kevin has been an entrepreneur, operator and investor in both Canada and US for over 20 years. Prior to co-founding Relay Ventures, Kevin was with the venture capital arm of Royal Bank of Canada where he was Vice President of Venture Capital and Managing Director of RBC Venture Partners.
Kevin holds an MBA with distinction from York University, Schulich School of Business, a BA degree in Strategic Studies from York University, and the ICD.D designation from the Institute of Corporate Directors’ Corporate Governance College at the Rotman School of Management. Kevin is the author of ‘Strictly Mobile – How The Largest Man-Made Platform in History is Changing Our World’ and the curator of the Strictly Mobile and Flying Upside Down conferences. He is a frequent public speaker and delivered the TEDx talk Hope is Not a Strategy in Brussels in 2014. Kevin is based in our Menlo Park office.

Andy Vitus
Board Member, Scale Venture Partners

Andy is a Partner at Scale Venture Partners (ScaleVP). Andy focuses on ScaleVP’s investments in next-generation enterprise software and new point of presence technologies – including virtualization and cloud computing. Prior to joining ScaleVP, Andy worked as a hardware engineer for Electronics for Imaging, designing embedded print server platforms and video compression circuits. Andy sits on the boards of Arena, Boundary, DataStax, Entone, PubNub, and INNOViON.

Jai Das
Board Member, Sapphire Ventures

Jai is a Managing Director at Sapphire Ventures. His primary focus is in the areas of software-defined infrastructure, cloud and mobile computing, smart machines, IoT and pervasive analytics. Jai has more than 15 years of experience helping companies innovate their product and marketing strategies in order to scale and become market leaders. He has led and manages the firm’s investments in Alteryx, Box (BOX), Cyphort, Five9 (FIVN), Justdial (JUSTDIAL), Mirantis, Mulesoft, Narrative Science, Nutanix, PayTM, PubNub, Socrata and Square.

Chris Donini
Board Member, The Raine Group

Chris is a Managing Director at Raine. While at Raine, Chris has executed numerous investments and advisory assignments, helping clients and portfolio partners develop and execute on their growth strategies through a variety of engagements across Raine’s technology, media and telecom verticals. Chris is involved in Raine’s growth equity investments and portfolio companies, including helping to lead Raine’s recent commitment to Televisa-Univision and its position in Vice, the latter of which he serves as a board observer.

Kevin Linker
Board Member, The Raine Group

Kevin is the Managing Partner of Raine Next-Gen Communications. Previously, Kevin worked at Serengeti Asset Management LP (2007-2011), a multi-strategy investment advisor based in New York City with over $1 billion in assets under management. He joined the fund pre-launch and assisted with the build out of the fund’s infrastructure, team and investment portfolio. Kevin was responsible for identifying, researching and managing all of the fund’s investments in the global technology sector, as well as the gaming, lodging and leisure sectors.

Luis Llovera

Luis is an employee of Robert Bosch LLC. He is a non-executive board director of RBVC’s portfolio companies Nextreme and Ogmento. Prior to joining Bosch in 2008, Luis was an Investment Partner for over 6 years with Siemens Venture Capital. Some of his investments included Agility Communications (acquired by JDSU), PubNub, GENBAND, Covega (acquired by Gemfire) and Polychromix. Luis has over 17 years of operating experience in the hi-tech industry.

Ankur Saxena
Board Observer, Cisco Investments

Amit leads global venture investing and M&A efforts in Internet of Things. Prior to Cisco, Amit was at Summit Partners where he led investments in Fleetcor (NYSE: FLT), MA-Com (NASDAQ:MTSI) and Rocket Internet (ETR: RKET). Previously, he was at Cummins Inc. where he led software development and product marketing activities. Amit also worked in investment banking at Citigroup, NY. He has led and managed Cisco’s investments in Ayla, Bitstew, Bolt.io, McRock Capital, PubNub, relayr and Veniam.

Albert Kim
Board Observer, Ericsson Ventures

Albert is the head of Ericsson's corporate venture capital group, based in Silicon valley. He represents Ericsson as a non-executive director on the boards of Pluribus Networks and Pubnub, and also manages Ericsson's investment in Drawbridge. Prior to joining Ericsson in 2014, Albert was a Managing Director at Investor Growth Capital, where he spent over 13 years in growth stage venture capital. Albert has a PhD in Applied Physics and also dabbled in banking (Goldman Sachs) and consulting (McKinsey) before joining IGC.

Todd Poole
Board Observer, HPE Pathfinder

Abhishek leads the venture investments for HPE Pathfinder across the HPE Portfolio ( including Aruba). Abhishek joined Pathfinder from GE Ventures where he was a Managing Director of software investing. His areas of focus at GE Ventures included IoT, cybersecurity, cloud+ edge computing and data analytics. He has served on numerous boards while at GE Ventures and Cisco including IoTium, Portworx, ThetaRay, Alchemist, The Hive, Equalum, Morphisec, Xage, Verodin, Flashpoint and eSentire. Abhishek received his MBA from the Haas School of Business at the University of California, Berkeley, and a Bachelor of Engineering in Electronics from the Delhi College of Engineering, India.