Executive Management Team

Rob Zandbergen

Rob Zandbergen (1958) has been CEO of RGF Staffing since 1 January 2018 and Chief Financial Officer since 1 January 2024. He is also Managing Corporate Executive Officer of Recruit Holdings and Head of Staffing Business. Previously, he was CEO of USG People (from 1 July 2010). He has been active in the temporary employment sector since early 2003.

Zandbergen has held various international and national executive and supervisory positions at publicly listed companies. He graduated from the Royal Netherlands Military Academy in Breda and holds a master’s degree in business economics from the University of Amsterdam. Rob Zandbergen holds Dutch nationality.

Shinya Yamamoto

Shinya Yamamoto (1982) has been Chief Financial Officer of RGF Staffing since 1 April 2024. In 2004, he joined Staff Service Group which eventually joined Recruit's staffing business unit. From 2012 to 2019 Yamamoto worked overseas where he first started as a member of Recruit Holdings’ M&A team.

In 2015, he joined Chandler Macleod Group, first as Integration Manager and Chief Corporate Administrative Officer. Later, he was appointed CEO of Chandler Macleod Group responsible for its diverse business portfolio across the Asia Pacific region. In April 2019, he moved back to Japan to take the CEO position of Recruit Staffing.

Shinya Yamamoto graduated from Doshisha University in Kyoto. He holds Japanese nationality.

Han Oey

Han Oey (1961) has been Chief Strategy Officer of RGF Staffing since 1 April 2019. Oey has started working for USG People, the predecessor of RGF Staffing in 2011. From 1 January 2018 he was promoted Global Director Business Development & Strategy of RGF Staffing. 

He started his career in the FMCG business followed by several international management positions in the telecoms industry in the areas of sales and marketing, M&A and strategy. Besides that, he is a co-founder and investor in innovative start-ups.

Han Oey holds an MBA from the Rotterdam School of Management, Netherlands and HEC, France and has the Dutch nationality.

Tomo Hachiya

Tomo Hachiya (1984) has been Chief Product Officer of RGF Staffing since 1 October 2023. He has worked for Indeed since 2018, among others as Chief of Staff to CEO of Indeed and Recruit Holdings. Most recently as Vice President of Expansion and PMO at Indeed Flex where he led the US product launch.

He started his career at Tokyo Disney Resort, in various positions spearheading numerous collaborations with The Walt Disney Company.

Tomo Hachiya graduated from Aoyama Gakuin University in Tokyo with a Bachelor's degree in Law and MBA at Texas McCombs School of Business. He has the Japanese and American nationality.

Michael Whitmer

Michael Whitmer (1964) has been a member of the Executive Management Team of RGF Staffing since 1 April 2019. He has been Chief Digital Officer of RGF Staffing since 1 January 2018, responsible for the Digital and IT domain. Whitmer holds a Bachelor of Science in Computer Science from University of West Georgia.

He’s been with Recruit since 1 July 2012 as operational CIO for Staffmark Group/Advantage Group UK, which he held until 1 January 2019.

He started his career as a software engineer and has worked in technology for over 33 years, 17 in staffing. For the past 20 years, he gained a strong business acumen while holding numerous roles managing Information Technology internationally. Michael Whitmer holds American nationality.

Yvonne Mastenbroek

Yvonne Mastenbroek (1981) has been Chief Sustainability Officer of RGF Staffing since 1 April 2023. She is over 17 years with the company in various roles, supporting the company through its growth stages, from a European listed company to a global organization as part of Recruit.

She has held several management positions like Chief of Staff at RGF Staffing global headquarters before being promoted to Chief of Sustainability Officer.

Yvonne Mastenbroek is passionate about building the most sustainable staffing company and bridging opportunities for all and has the Dutch nationality.

Non-executive board

Hisayuki Idekoba (Chairman)

Executive Vice President and COO, Board Director, Head of HR Technology Business, CEO of RGF OHR USA, Inc., Chairman of RGF Staffing B.V.


Ayano Senaha

COO and Managing Corporate Executive Officer of Recruit Holdings Co., Ltd.


Akihiko Mori

Corporate Executive Officer of Recruit Holdings Co., Ltd. (Finance, Accounting & Tax).