Mimecast Leadership


    Marc van Zadelhoff

    Chief Executive Officer

    Marc van Zadelhoff joined Mimecast as the company's second CEO and member of the board in January 2024, where he will lead all aspects of the business and guide the company as it enters its third decade of operation.

    He is an accomplished executive with 25 years of experience in the cybersecurity industry. Prior to joining Mimecast, Marc was the CEO of Devo Technology, a cloud-based logging platform that he led through an intense growth phase where they raised $350M and tripled revenues. He also spent time as COO at LogMeIn, and was GM /CEO of IBM Security, an IBM Business Unit that he co-founded. Under his leadership, IBM Security grew to 8,000 employees and $2.5 billion in revenue.

    Marc is a curious and committed leader that puts Mimecast’s 2,200+ employees first and works alongside them to ensure customer organizations can work protected. He was born in the Netherlands and currently resides in the Boston-area with his wife and three daughters. He holds an MBA from The Wharton School of the University of Pennsylvania and obtained a B.A. from Bowdoin College.

    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.

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    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.

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    Chris Wey

    Chief Transformation Officer

    Chris Wey joined Mimecast in 2024 as the Chief Transformation Officer. With over 25 years of broad enterprise software experience, Chris will be taking on cross-functional, transformative projects to position Mimecast for sustainable growth.

    Most recently, Chris was President of the Data Modernization business unit at Rocket Software, where he led engineering and product management and drove GTM success. Throughout his career, he has held a variety of roles including Corporate Development, Strategic Partnerships, M&A Integration, Engineering, and Sales Operations at Carbonite, Avaya and IBM. His consistent focus has been on driving growth, organically and inorganically, in rapidly evolving IT markets, and building the robust organizational infrastructure to support that value creation.

    Chris holds a Bachelor of Science in Electrical Engineering from Boston University. He was born in Switzerland, and he and his four children take every opportunity to return to Europe for family visits.

    Janet Prosper

    Chief Human Resources Officer

    Janet Prosper was named Chief Human Resources Officer in November 2023. She joined Mimecast in February 2020 as Senior HR Director and has served as interim CHRO since October 2022, and Vice President, Human Resources, since May 2021. Janet leads Mimecast’s diversity, equity, and inclusion initiatives and partners with the executive team to shape the company’s people and organization’s strategic roadmap, driven by 'The Mimecast Way’ values.

    Janet has nearly three decades of experience leading HR teams in large, global organizations. A considerable part spent working in software/technology organizations undergoing transformation. She also held senior leadership roles with global responsibilities at CareerBuilder, Ciena and Equifax.

    During her career she has led all aspects of human resources: transformation, organizational design, change management, culture and employee offering, talent management, and leader development.

    Janet has a Bachelor of Arts degree in Business Administration and Human Resources from the University of Westminster.


    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.

    David Helfer

    Chief Customer and 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.

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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.

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