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Experienced Change Consultants

Meet our international group of experienced consultants

Koen Veltman

Koen Veltman is a true believer in business as a force for good. Koen has over 10 years of experience as consultant at McKinsey & Company, Aberkyn and SparkOptimus. Building hands-on expertise in over 40 organizations in transformation topics like designing and delivering large scale change, organizational design, leadership development, Agile, Lean, strategy to execution, culture change at scale, and front line customer excellence. Working across a broad number of industries and geographies with organizations ranging from 5 people start-ups as well as 250,000 people collectives.

Additionally, Koen held a role as COO in a venture, worked at an energy efficiency startup, supported multiple NGOs and is a board member of the non-profit INDEVOR for which he was the founder of INDEVOR consulting. He holds an MBA from INSEAD and an MSc in Econometrics and Quantitative Finance from Tilburg University.

Koen is the founder of OrganizationBuilders and was the third Holacracy Certified Coach in the Netherlands.

Pieter Wijkstra

Pieter Wijkstra holds an MSc in Aerospace Engingeering from Delft University of Technology. He was actively involved in two startups which closely cooperated with the university. At McKinsey &  Company’s Amsterdam office, Pieter worked on strategic, operational and organization projects for international clients before joining Rotterdam based shipping company Anthony Veder in commercial and project management roles.

Having seen many different companies, varying in size and industry, it struck Pieter that many organizations struggle with adapting their organization in changing environments. Pieter is convinced that Holacracy’s focus on organizing around work instead of people and powering individual employees with freedom and responsibility will support organizations to cope with changing environments.

Pieter has recent hands-on experience of applying Holacracy at a digital media start-up and is a Certified Holacracy Coach.



Rinze Krijgsman is an organizational psychologist and his drive is to bring out the best in people and organizations. He connects personal goals to the ambitions of the organization.Rinze is an experienced management consultant and international management trainer. He is transparent, energetic and he likes to encourage people to take deliberate action.

Rinze is known as a challenger and is a creative out-of-the-box thinker. During his study of Work and Organizational Psychology he also studied at the conservatory (trumpet). His goal within OrganizationBuilders is: 'Scaling up excellence!'


Anna Swinkels is a star in organizing and bringing people together. She studied to become a Montessori primary school teacher and studied Office Management for a couple of years. She discovered a common theme, her love for supporting people and helping them to improve themselves. 

During the five years Anna worked in childcare, she had many different roles from the receptionist and human resources to planning and childcare worker. She learned how to be flexible and multitask, always with a smile! After these years she made the switch to commercial business. SparkOptimus was in 2013 a fast growing consultancy agency with ten employees. Anna has seen the company grow to fifty employees and was intimately involved during this explosive growth period. Her central role was that of personal assistant to managing partners.

At OrganizationBuilders, Anna has many different roles, from Website administrator and IT support to Event organizer and Culture Amplifier. With her pragmatism, attention to detail and openness, she helps OrganizationBuilders grow.

You can run into Anna on a Salsa party, behind a sewing machine, traveling with her husband, with her nose buried in an English thriller book or laughing at Van Kooten and De Bie.