Mission & Vision

At Doser, our primary goal is to enhance the quality of care that patients receive. We do this by developing advanced technological tools that enable pharmacists to deliver personalized therapy to patients. By helping pharmacists we also help doctors and therefore patients as well. By leveraging our cutting-edge technology and harnessing the expertise of pharmacists, we aim to empower healthcare providers with the tools they need to deliver exceptional patient care. 

“Every patient deserves medication with optimal results and minimal side effects”

Our story:

Doser was formed from a shared vision between our founders and a desire to fill healthcare industry needs. This was a desire to help those patients that no sees. These patients were not getting the optimal care. This realization inspired our founders to start Doser and embark on a mission to revolutionize how medicine is delivered. Our founders brought together a decade of expertise in 3D printing and the pharmaceutical industry to form Doser. Since then, they have been on an adventure to improve the care provided by pharmacists to patients.


Our advisors are esteemed professionals and industry experts who bring diverse knowledge and experience from a wide array of scientific disciplines. They guide our organization’s scientific direction and strategy, ensuring that our activities, initiatives, and research adhere to the highest standards of scientific rigor and integrity.

Ron de Graaff

With over four decades of consultancy experience in the pharmaceutical and medtech sectors, Ron brings an unparalleled depth of knowledge and expertise to our board.

Rein Strijker

Rein is an esteemed member of our Scientific Advisory Board, bringing invaluable experience and a deep understanding of the life sciences and health market.

Kirsten Schimmel

Kirsten’s extensive background in pharmaceutical manufacturing and hospital pharmacy enhances the breadth of our board’s knowledge and aids in steering our strategic decisions.

Meet the team

Arjan van Unen - CEO

Arjan holds an MSc with the focus on Mechatronic System Design and has experience in business development and operations.

As an entrepreneur he knows that growing a disruptive company will go with ups and downs, but in his opinion this is part of the fun. He will not give up reaching the goal of bringing better quality medicine to patients.

Niels Ouwerkerk - CEO

Niels holds a Ph.D. in bio-organic photochemistry and bio-organic synthesis from Leiden University. He has 20 years of experience in industrial R&D and has held several positions at large companies, such as Unilever, DSM and Astellas Pharma.

Niels has extensive experience with drug development covering the complete life cycle.

Fereshteh Shokri - Senior Industrial Pharmacist

Fereshteh holds a doctorate in business administration (DBA). She has more than 10 years of working experience in clinics and pharmaceutical organizations.

She contributes to the coordination of pharmaceutical R&D activities, leads innovative formulation development projects, and helps with strategic planning.

Jelle Hogervorst - Mechanical Engineer

Jelle is a toolmaker from  the Leidse Instrumentenmaker School.

He decided to stay after finishing his graduation project at Doser, because he loved the working environment and discovered many growth opportunities.  Jelle keeps everyone happy and makes sure that our hardware is of excellent quality.

Sander Rozeboom - QA Manager

Sander is our Quality Assurance Manager with a Bachelor’s in Biomedical Sciences. He has a keen interest in learning the processes around the lab, particularly in QA, finding the intricacies of documentation fascinating. He is responsible for continuous improvement regarding the QMS at Doser. Sander has a passion for reading, cycling, and all things technology.

Koen Kalkman – Software Developer

After graduating as a MSc in Applied Physics, Koen pursued a career in software engineering. In this field he now has more than 8 years of experience. Koen is responsible for the software that makes all parts of the DoseRx1 product work together. Making the lives of customers and colleagues easier and better is what makes him enjoy every day of work. 

Sophie Verhoeven - Junior CMC Manager

Sophie studied Bio-pharmaceutical sciences at the University of Leiden. At Doser she worked on the development of a platform to increase the palatability of pharmaceutical formulations that could be printed with the 3D-printer that Doser developed and decided to stay as part of the pharmacy team at Doser after her internship. 

Ratna Ganesna - Head of Engineering

Ratna holds an M.Sc. in Mechanical Engineering from KU Leuven.
He has 5 years of experience in the automotive industry working in high growth electric vehicle startups and additional 2 years of experience as an entrepreneur setting up his own 3D printing ventures. At Doser he manages technology development and the manufacturing of the DoseRx1.

Arian Khoshchin - CCO

Arian holds a MSc in Bio Pharmaceutical Sciences and Industrial Pharmacy. He gained experience as a Qualified Person in training for biotech companies in early clinical phases. Arian has worked within various business and commercial roles generating revenue and growth in the life science field.  As Doser’s Chief Community Officer he is responsible for market development and growth.

Olin Verhoog - Formulation Developer.

Olin is a formulation developer with a Bachelor in Bio-Pharmaceutical Sciences at Leiden University. Before starting her master’s degree, she wanted to gain some work experience in the pharma field. In addition to her work at Doser, Olin passionately competes in ice speedskating marathons at the highest level.

Tessa Mellema – Product Engineer

Tessa holds a master’s degree in Integrated Product Design from TU Delft and currently serves as our Product Engineer. During her studies, she focused on products utilizing software and electronics, this knowledge she applies in her work by designing practical innovations rather than gimmicky functions. Leveraging her prior startup experience, she works on Doser’s upcoming printer updates.

Lodi Elonga - Intern

Lodi is a final-year pharmacy student from the University of Lyon. He aspires to work in international business and market access for healthcare technologies. Lodi works as a business development intern at Doser, where he assists the business development team and conducts a study on the impact of 3D printing in pediatrics. Enthausiastic and curious, Lodi is driven by a desire to learn in this startup at the heart of 3D printing Innovation. 

Bushra Kiamoeddin - Internship formulation development

Bushra is a Bio-Pharmaceutical Sciences student at Leiden University. During her studies, she gained an interest in the 3D printing technology of drugs. Currently, Bushra conducts an internship at Doser, where her focus lies on improving pharmaceutical formulations using 3D printing technologies. Excitedly she looks forward to her time at the company and gaining tremendous experience.