Team

Our Amazing Team Meet The Crew

We are very proud to work with this fantastic group of people.

Giel Hendriks

Chief Executive Officer

Paula van Rossum

Chief Business Officer

Remco Derr

Chief Operating Officer

Marlon Dijkshoorn

Chief Financial Officer

Giel Hendriks

Chief Executive Officer

Giel Hendriks has a PhD in molecular biology from Utrecht University and worked for four years as a post-doctoral fellow in at Leiden University, studying the relationship between DNA damage and gene mutations. After this fundamental scientific projects he made a switch and worked for six years a senior scientist at the Leiden University Medical Center on the development of in vitro reporter systems to detect and understand the mechanisms of genotoxicity. During this period, he has been instrumental in the development of the ToxTracker assay.

In 2014, Giel obtained pre-seed financing from NGI to start Toxys and to bring the ToxTracker assay to the market. As CEO of Toxys, he worked to develop the company into an internationally recognised contract research organisation (CRO) in genetic toxicology and chemical safety testing for the pharmaceutical, cosmetics and chemical industry.

After winning the HollandBio BioBusiness Masterclass in 2015, in the beginning of 2016 he secured Seed financing from InnovationQuarter and the Zeeland Investment Fund to establish a new Toxys laboratory, further grow the company and continue the development of innovative in vitro cell assays for mechanistic toxicity screening.

Paula van Rossum

Chief Business Officer

Paula van Rossum joined Toxys in 2016 and is the Chief Business Officer. Paula is a driven professional with a track record in BD & Sales. She was Chief Business Officer for OcellO, a spin-off company from Leiden University where she was involved in the business development and business management. Previously she was project manager Life Sciences at the Utrecht Science Park where she was involved in the promotion and acquisition and Liaison Officer for the LACDR (Leiden University). Paula studied biomedical sciences and graduated in both the Research and Business track.

Remco Derr

Chief Operating Officer

Remco Derr joined Toxys in 2014 and is Chief Operating Officer. He studied biomedical sciences at the university of Ghent (Bachelor) and university of Leiden (Master). During his master he did a research internship at the department of Toxicogenetics in the Leiden University where he studied DNA damage mechanisms. He joined Toxys in 2014 and has been on board since the beginning. Within toxys he oversees the performance of the fee-for-service screening and helps to develop novel applications of the ToxTracker assay.

Marlon Dijkshoorn

Chief Financial Officer

Having more than 25 years of experience in financial management from large enterprises to venture funds and small technology companies, Marlon acts as part time CFO for Toxys. From 1999 to 2004 Marlon was CFO for Life Science Partners assisting in the establishment of Funds I and II. During 2005 Marlon established Finmar B.V. a boutique financial advisory and management service for SMEs in the health and medical sectors. Marlon provides financial planning, tax and strategic support for SMEs in the early phases. Having experience of sitting on both sides of the risk capital table Marlon provides critical support in raising capital investments and  delivering timely and high quality information to both management and shareholders. Marlon holds a degree in Business Economy from the Erasmus University.

Inger Brandsma

Senior Scientist

Myrto Dimopoulou

Senior Scientist

Sabine Hartvelt

Junior Scientist

Tom Zwetsloot

Laboratory Technician

Inger Brandsma

Senior Scientist

Inger Brandsma obtained her PhD from the Erasmus Medical Centre in Rotterdam, where she studied the role of changes in DNA double strand break repair in cancer cells relating to resistance to PARP inhibitors. After completing her PhD, she worked as a postdoc at the Institute of Cancer Research in London for two years, continuing her work on mechanisms of PARP inhibitor resistance. In 2018, Inger joined Toxys as a senior scientist, utilising her expertise in DNA damage responses, genome stability and cancer to develop novel mechanistic toxicity assays.

Myrto Dimopoulou

Senior Scientist

Myrto Dimopoulou obtained her PhD from Wageningen University, where she studied the implementation of alternative in vitro models to detect the developmental toxicity of a specific group of chemicals (azoles). In parallel, she obtained her certification as European Registered Toxicologist (ERT). After completing her PhD, she worked as regulatory toxicologist and human risk assessor. In 2020, Myrto joined Toxys as a scientist to apply her expertise in developmental and mechanistic toxicology to further develop the ReproTracker assay.

Sabine Hartvelt

Junior Scientist

Sabine obtained a Bachelor’s and Master’s degree in Biomedical Sciences from Leiden University. She performed her final internship at the department of Metabolic Health Research at TNO in Leiden, working on the development of an in vitro model for liver fibrosis. After graduating, Sabine joined Toxys in 2018, where she will apply her knowledge on cell culture to the ToxTracker and ReproTracker assays.

Tom Zwetsloot

Laboratory Technician

Tom holds a Bachelor’s degree from the Leiden University of Applied Science in Biology and biomedical sciences. After his graduation, Tom held the position of Research Technician at the Leiden University Medical Center, department of anatomy and embryology. In his role as research technician he worked on stem cell differentiation. Tom joined Toxys in 2017 where he will apply his experience in stem cell research to the development of ReproTracker.

Nynke Moelijker

Laboratory Technician

Gaonan Zhang

Laboratory Technician

Marianne Brummelkamp

Office Manager

Pereni K

Marketing Manager

Nynke Moelijker

Laboratory Technician

Nynke holds a Bachelor’s degree from the Amsterdam University College and a Master’s in Applied Biotechnology from the University of Uppsala. Before joining Toxys in 2017, Nynke worked as a Marie Sklodowska-Curie fellow at the University of Zurich where she studied the impact of exercise on red blood cell properties. At Toxys, Nynke is performing ToxTracker and other mechanistic toxicity assays for our sponsors.

Gaonan Zhang

Laboratory Technician

Gaonan obtained her first Bachelor’s degree in Agriculture from Shenyang Agriculture University and her second Bachelor’s degree in Life Science from HAN University of Applied Sciences. She performed her internships at the departments of Dermatology and Human Genetics at Radboud UMC in Nijmegen. Before joining Toxys in 2020, Gaonan worked as a DNA sequencing technician. At Toxys, Gaonan is performing ToxTracker and other mechanistic toxicity assays for our sponsors.

Marianne Brummelkamp

Office Manager

Marianne Brummelkamp joined Toxys in 2019 as Office Manager. Marianne is a professional Office Manager, with over 30 years of experience in working in an (international) environment. After finishing her education at Schoevers, she has worked at companies in various branches, among which construction; real estate; floriculture; petro-chemical industry and management training. At Toxys, she is the overall Ms fix-it and troubleshooter.

Pereni K

Marketing Manager

Pereni obtained her Bachelors in Life Sciences with a minor in Communication and New Media at the National University of Singapore. She found her passion for marketing in the biomedical industry throughout her internships and her Masters in Biomedical Science Management at Leiden University. She uses her creativity and scientific knowledge to help highlight the products and expertise of Toxys.

Our sales consultants provide us with their expertise and business development support.

Hanna Frykman

Director BD & Sales

Ruairí Mac Síomóin

Japan liaison

Hanna Frykman

Director BD & Sales

Hanna works for Toxys since 2020 as Independent Consultant in Business Development and Sales. She has vast experienced in sales, marketing and business development demonstrated in a history of working in the life science and start-up industry on national and international arena. Previously Hanna worked at the Swedish life science company SenzaGen where she was building up marketing, communication and sales from start-up through an IPO.

Hanna has done her Master studies at Lund University in Physical Geography and minor in General Business Studies, she did her Sales education in Dublin and followed up with Strategic Marketing education at IHM Business School in Sweden.

Ruairí Mac Síomóin

Japan liaison

Based in Japan, Ruairí is our primary point of contact for Toxys’s Japanese customers and interested parties. With over 25 years’ experience in the pharma / life sciences field, Ruairí provides a strong connection to the Japanese market, allowing Toxys to expand its reach in Asia. Ruairí received his M.Sc. from the Institute of Medical Science of the University of Tokyo and his B.Sc. from the Moyne Institute of Preventative Medicine at Trinity College, Ireland. Ruairi has previously worked at Chugai Pharmaceutical Co. Ltd. in Tokyo and Amersham Biosciences Japan (now GE Healthcare). His academic and industry research experience has been in the infectious disease and oncology areas.