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Meet the management team

Rienk de Vries – CEO

Rienk is a hands-on global business executive and strategist. Prior to starting at Intero, he was already on board as Managing Director at A.Hak Industrial Services, leading the company into its new form as Intero Integrity.

For more than 15 years, he worked at Applus RTD in a variety of business leading roles. Guiding the company though a journey of internationalization, professionalization and significant growth. Rienk also worked as Chief Commercial Officer for an Offshore Service provider in Oil & Gas and renewables.

Rienk holds a bachelor degree in oil and gas engineering (cum laude), a master degree in maintenance management and a MBA (cum laude). He is married and has 4 children. In his free time he enjoys sailing, snowboarding and cooking.

Martijn Petit – CFO

Martijn Petit


Martijn joined Intero in February 2018 following the acquisition by First Reserve as CFO. He is a results driven, hands on professional with a can-do mentality. In his professional life before Intero, Martijn worked with Alvarez & Marsal in the restructuring and the transaction services practice. Prior to that Martijn worked at KPN and KPMG.

Martijn is a chartered accountant (RA), studied in Rotterdam and has a master in business administration from RSM and a master in Sociology from the Erasmus University.

Martijn is married and has three sons. Martijn enjoys his work, family life and his hobbies rowing and skiing.

Winifred Meester - Business Director Industrial and Inspection Services

Winifred Meester


Winifred has a strong technical back-ground and holds a bachelor degree in oil and gas engineering and has worked in the market for over 20 years.

He started his career at A.Hak Industrial Services and moved on to NAM, later to rejoin the new Intero Integrity Services team.

He has a strong international reputation and track record in industrial services with unique innovative differentiating services in its portfolio. His fast business experience and a strong technical and ‘change management’ background which will allow him to build along, further strengthen and develop the company.

Winifred is married with two daughters and two sons. He enjoys his work, family and his hobbies: windsurfing, cycling, fitness and running.

Philippe Guldemont - Managing Director Intero The Sniffers

Philippe Guldemont


Philippe joined Intero - The Sniffers in 2022 and is an entrepreneurial executive with over 25 years of successful industry experience. Prior to joining the company, he has held various senior management positions in downstream petroleum companies as well as oil & gas service and infrastructure providers, with a particular focus on business development and operational excellence.

Over the years, he has gained a unique international business experience thanks to several expat assignments in Europe, Africa and the Caribbean.

Philippe holds a bachelor’s degree in economics and a MBA in Internal Management. He is married and has 2 children.

Peter Sterzing - Area Manager North and South America

Peter Sterzing

Peter joined Intero with over 20 years’ experience in the energy industry. He held roles of increasing leadership and responsibility across engineering, manufacturing, operations, business development, and mergers & acquisitions (M&A).

Upon graduation from college, Peter entered the United States Marine Corps, serving as a surface to air missile officer, as well as well as an aviation weapons and tactics instructor. He moved to Houston, Texas in 1998, where he began working for General Electric (GE), at its aero derivative turbine generator manufacturing plant. In 2003, Peter transitioned to the recently acquired GE company, PII Pipeline Solutions, where he became the North American Regional Manager in 2004. His responsibilities included pipeline inspection services for over 30,000 kilometers of pipelines each year across the United States, Canada, Mexico, and the rest of Central America. After GE, Peter worked for two different oil and gas midstream companies, before returning to the services business at Intero in 2019.

Peter earned a Bachelor of Science degree in Electrical Engineering from Texas A&M University, and an MBA in Finance and International Business from the University of St. Thomas.

Peter is married, with 4 children, two daughters and two sons, along with two dogs. He enjoys running, scuba diving, and watching college football.”

Djaffar Hadji - Area Manager Middle East 

Djaffar Hadji


Djaffar was appointed Area Manager Middle East in 2012, then still A.Hak Industrial Services. He set up the branch in Abu Dhabi in 2003 turning it into one of the most successful entities within the group.

Originally from Algeria, Djaffar moved to the USA in 1977 where he graduated from the University of Southwestern Louisiana in 1982 in Petroleum Engineering. He worked at to Algerian National Oil Company Sonatrach, at Challenger Special Oil Services and Saipem SA France.

Djaffar is married and has a two children.

Shukor Yatim - Area Manager South East Asia 

Shukor Yatim

Shukor's early career achievements started in his late 20s when he was entrusted by International Refinery Services Pte Ltd (Singapore) to lead the company's first global markets expansion in the Philippines. Under his stewardship as Managing Director of IRS Phils Inc (later known as RIM Phils Inc), the company had seen significant growth in a challenging market.


He holds a Masters degree in Business Administration and believes in lifelong learning for professional and personal growth. His hobbies include golfing, flying, riding motorcycle and full-contact karate.