DEERNS WORLDWIDE Markets Projects Services About Deerns Careers Contact Group Executive Board Mission & Vision, Core Values Board Organisation Chart CSR History News Press Publications Code of Conduct Tjerk van der Meer (1974) Chief Executive Officer Deerns Group Tjerk van der Meer serves as Chief Executive Officer of Deerns Group since March 2021, after joining as a member of the Group Executive Board in Q3 2019. With a background in engineering and business, Tjerk occupied various international and management positions at Royal BAM and Royal HaskoningDHV earlier in his career. Latest before joining Deerns, Tjerk was globally responsible for commerce and strategy in the Manufacturing & Technology sectors at Arcadis. Roel Rooskens (1967) CFO Deerns Group Roel Rooskens is CFO of the Deerns Group and member of the Group Executive Board since January 2012. Prior to joining Deerns in 2011, Roel has worked in various financial roles within the Telecom and IT industry and lastly as a Group Controller for the Insulation & Rooflights division of a large building materials company, CRH. He holds a degree in Economics from Tilburg University, The Netherlands. In 2004 Roel completed the RC Post Master Controllers Programme at the Nyenrode University, The Netherlands. Jan Karel Mak (1957) Executive Board Member Deerns Group Jan Karel Mak served as Chief Executive Officer of Deerns Group from July 1999, when he joined the firm. On 1 March 2021 he transferred his CEO role to Tjerk van der Meer while remaining a Member of the Executive Board. After graduating in Environmental Sciences (Wageningen University) Jan Karel worked as a consulting engineer, project manager and managing director at engineering firms DHV and Arcadis, and as a management consultant at McKinsey & Company. Among Jan Karel’s other activities are Board roles in various charitable organisations as well as supervisory and coaching roles in several Dutch technology companies. Share this article with Deerns brings concepts to life Privacy Privacy statement of Deerns Groep B.V. Contact Select an office +31 88 374 0000 contact@deerns.com © 2021 Deerns, all rights reserved - Disclaimer

DEERNS WORLDWIDE Markets Projects Services About Deerns Careers Contact Publications Mission & Vision, Core Values Board Organisation Chart CSR History News Press Publications Code of Conduct CSR 2019 movie CSR report 2019 CSR Report 2017-2018 CSR Report 2016 Portfolio book Bespoke Engineering 85 Years of Bespoke Engineering Corporate movie Deerns brings concepts to life Privacy Privacy statement of Deerns Groep B.V. Contact Select an office +31 88 374 0000 contact@deerns.com © 2021 Deerns, all rights reserved - Disclaimer