Mimecast Leadership


    Peter Bauer

    Chief Executive Officer

    Peter Bauer is the CEO, Co-founder and Board Member at Mimecast, which he launched in 2003 with fellow Board Member and Co-founder, Neil Murray.

    He is the visionary behind Mimecast's SaaS strategy, which empowers businesses across the globe with comprehensive cyber resilience for email. Mimecast's security, archiving, business continuity and risk mitigation products and services are all delivered from a single cloud platform. This home-grown, pure-cloud delivery mechanism enables an intuitive user experience, suited to the way people interact with email today.

    The combination of next-generation technology and seamless integration with existing email systems, is the driving force behind Mimecast's success in its mission to transform the way people remain productive, collaborative and efficient in today's ever-changing threat landscape.

    Peter was born and raised in South Africa, trained as a Microsoft systems engineer, and began working with corporate messaging systems in the mid-1990s. He moved to the UK where Mimecast was founded and then moved once more, arriving in Boston, Massachusetts in 2011, to lead Mimecast's aggressive push into North America. Since that time, Mimecast has been one of the strongest performers in its market segment in terms of customer acquisition and top-line growth, making Peter one of only a handful of CEOs to have lead a pure-Saas company for over 15 years while acquiring tens of thousands of customers worldwide.

    Rafe Brown

    President and Chief Operating Officer

    Rafe Brown joined Mimecast in March 2019 as Chief Financial Officer, overseeing global financial strategy and operations, including accounting, tax, treasury, investor relations and real estate.

    In September 2022, Rafe took on the mantle of President and COO, overseeing the strategy, operating model and transformation initiatives that will guide Mimecast through its next stage of accelerated growth, with a focus on providing enhanced customer and partner experiences.

    Rafe brings more than 20 years of experience leading high-growth software companies. Prior to joining Mimecast, Rafe served as the Senior Vice President, Chief Financial Officer and Treasurer of SevOne, Inc., a provider of digital infrastructure management solutions. Before SevOne, Rafe served as Senior Vice President, Chief Financial Officer and Chief Administrative Officer of Pegasystems, Inc., a publicly traded global business process management software provider.

    Additionally, Rafe served in leadership positions at Salesforce, Inc. for several years, including as a Senior Vice President of Finance, where he helped grow the company to a $4 billion entity. He began his career at the accounting firms of Arthur Anderson and PricewaterhouseCoopers.

    Rafe holds a certified public accountant (CPA) designation. He holds a Master of Accounting from Brigham Young University and a Bachelor of Science in accounting from Southern Utah University.

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    David Call

    Chief Financial Officer

    David Call joined Mimecast in May 2023 as Chief Financial Officer. He is an accomplished finance executive with over 20 years of leadership experience in high tech and enterprise software environments. As CFO, Call helps shape the company’s strategic roadmap and plays a key role in helping Mimecast exceed its growth and financial goals, while fostering a collaborative, values-driven culture. Call most recently served as CFO with defi Solutions. Previously, he spent 7 years at McAfee where he served as business unit CFO for both consumer and enterprise security divisions. Call also spent more than 10 years at Intel in various senior leadership finance roles, including their Software & Services Group and the Intel Platform Security Group, before taking a leadership role at McAfee following Intel’s acquisition.

    Call has a BS in Accounting from Brigham Young University and an MBA in Finance from UCLA.

    David Raissipour

    Chief Technology & Product Officer

    David joined Mimecast in 2021 as Chief Technology & Product Officer (CTPO). He will bring together Mimecast's product management and engineering organizations into one fully integrated team. Raissipour will support the company's strategy to accelerate innovation to serve customers and partners.

    Prior to joining Mimecast, David was the senior vice president, Sophos Cloud Platform Group & Sophos Messaging Security Group at Sophos from 2016-2020. He has experience across a diverse set of enterprise software products, and prior to joining Sophos, he held executive roles at Carbonite and RSA. He worked at Microsoft Corporation for 14 years, holding numerous senior leadership roles.

    David holds a Bachelor of Science degree in Computer Science from Central New England University.


    Norman Guadagno

    Chief Marketing Officer

    Norman Guadagno joined Mimecast in November 2022 as Chief Marketing Officer. With over 20 years of B2B and B2C marketing experience, Guadagno oversees Mimecast’s marketing organization, and plays a critical role in accelerating the company’s product-led growth strategy via revenue and customer acquisition, storytelling, and channel partner initiatives.

    Guadagno has deep expertise leading business transformation initiatives, including brand building and GTM strategy, within competitive markets. Prior to Mimecast, he served as CEO of Norbella, a full-service media agency that partners with a range of brands like athenahealth, Boston Symphony Orchestra, and Cybereason. Prior to Norbella, Guadagno was the Chief Marketing Officer of Acoustic, a marketing and customer experience SaaS company, where he oversaw the company’s corporate marketing, strategic branding, and GTM initiatives. He has also held senior marketing roles at Carbonite, Microsoft, and Oracle.

    Guadagno holds a Master of Arts degree in psychology from Rice University and a Bachelor of Arts degree in psychology from the University of Rochester.

    Mick Paisley

    Chief Security and Resilience Officer

    Michael Paisley joined Mimecast in 2020 as Chief Security and Resilience Officer. With nearly 20 years’ experience as a CISO in multi-national, highly targeted and highly regulated organizations, Mick is well-versed in operating at the continually evolving intersection of cyber security, resilience, quantitative risk and advanced data analysis.

    During his career, Mick has successfully developed and executed efficient threat- and risk-based cyber resilience strategies that have reduced aggregated cyber loss exposure, while enabling colleague’s productivity for several large and complex organizations. Prior to joining Mimecast, Mick was CISO at Verifone Inc a global payments provider. He was previously CSO for Vocalink, a component of the UKs critical National Infrastructure where he successfully led the first formal CBEST testing of any financial services organization with full transparency of the process to key stakeholders. Before that, Mick was responsible for all aspects of cyber resilience, digital risk, e-fraud, business continuity planning and crisis management for Santander UK.

    Mick holds a Bachelor of Laws degree and a Master of Science degree in Security and Organizational Risk Management from the University of Leicester.

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    Chris Dollase

    General Counsel

    Chris Dollase joined Mimecast in October of 2017 as deputy general counsel, vice president and chief compliance officer. In February 2023, he was promoted to general counsel and senior vice president to lead the legal, compliance and assurance, risk and control teams at Mimecast. Chris and his team work to provide business centric legal advice to all of Mimecast. The team maintains Mimecast’s culture of integrity and compliance while delivering on the company’s growth strategy.

    Mimecast’s legal team helps 40,000+ customers work protected and be successful in an everchanging threat landscape. Chris is an experienced cybersecurity executive who spent 15 years at RSA, The Security Division of EMC, prior to joining Mimecast. He served as lead counsel for RSA and assistant general counsel for EMC and was a member of RSA’s leadership team.

    Chris has helped navigate Mimecast through seven acquisitions during his tenure, and most recently played a vital role in Permira’s acquisition in May 2022. Chris holds a Doctor of Law J.D. degree from the University of Maryland Francis King Carey School of Law and a Bachelor of Arts in History from Middlebury College.

    David Helfer

    Chief Revenue Officer

    David Helfer joined Mimecast in January 2023 as Chief Revenue Officer. He is an accomplished go-to-market executive with extensive global leadership experience in highly complex infrastructure and security organizations. As CRO, David will lead Mimecast’s global sales organization and help drive its short- and long-term revenue goals.

    Prior to Mimecast, David served as vice president of enterprise sales, Americas at GitLab, Inc. His successful international background also includes time as a senior vice president at F5, leading worldwide channels and EMEA sales based in London, UK. David also spent 14 years at Juniper Networks where he helped grow revenue streams in various executive roles.

    David holds a Bachelor of Arts degree in Political Science from Kalamazoo College.


    Jeff Hess

    Chief Customer Officer

    Jeff Hess joined Mimecast in April 2023 as Chief Customer Officer. Jeff brings more than 35 years of experience guiding customer success and excellence. He has a proven track record of delivering world class customer satisfaction and retention, and driving profitable growth at scale for global organizations – dedicating his career to reimagining the relationship between software companies and their customers.

    Prior to Mimecast, Jeff served as Chief Customer Officer for TIBCO, where he stewarded the organization toward a more innovative and impactful customer excellence model constructed around value-based selling and value realization. Prior to TIBCO, Hess held senior leadership positions at BMC Software and SAP, overseeing strategic sales, renewals, go-to-market strategy, value engineering, and more.

    Jeff holds a Master of Business Administration degree in Finance from Emory University’s Goizueta Business School and a Bachelor’s degree in Chemical Engineering from the University of Delaware.

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