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

Amer Jamalpoor

Chief Scientific 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 the 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.

Amer Jamalpoor

Chief Scientific Officer

Amer Jamalpoor obtained his Master’s degree in Biomedical Sciences (Human Toxicology specialisation) from Radboud University in Nijmegen. During his study, he evaluated clinically relevant drug-drug interactions and drug toxicity in human cells and animal models. During his Ph.D. at Utrecht University, he developed and modelled human kidney proximal tubule cells and kidney organoids by combining CRISPR-Cas9 and omics technologies to identify and test toxicity profiles of potential therapeutic agents for monogenic kidney disorders. In November 2020, Amer joined Toxys as a lead scientist, utilising his expertise to further develop and commercialise ReproTracker and additional in vitro assays for developmental toxicology.

Marlon Dijkshoorn

Chief Financial Officer

Inger Brandsma

Study Director

Bas ter Braak

Study Director

Sabine Hartvelt

Study Director

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

Study Director

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.

Bas ter Braak

Study Director

Bas holds a Master’s degree in Biotechnology from the Wageningen University. After completing his PhD at the Leiden Academic Centre for Drug Research (LACDR), he was a postdoctoral researcher at Leiden University. Together with a small team of PhD students, he generated CRISPR/Cas9 mediated fluorophore knock-ins in human induced pluripotent stem cells to study compound-induced stress signalling processes in differentiated reporter cell lineages. He also co-developed the HepG2 BAC-GFP reporter platform. Bas joined Toxys in 2020 as a senior scientist to commercialize the HepG2 BAC-GFP reporter platform.

Sabine Hartvelt

Study Director

Sabine Hartvelt obtained her master’s degree in Biomedical Sciences, during which her research focused on the use of human stem cells for in vitro models to investigate disease pathology. Sabine joined Toxys in 2018 and since then, she has been involved in the development and commercialization of the ReproTracker assay. Sabine is currently working as the study director for ReproTracker and plays an important role in developing and extending the applicability domain of the assay.

Marit Hoogenboom

Scientist

José Manuel Horcas Nieto

Scientist

Jing Fang

Scientist

Gaonan Zhang

Associate Scientist

Marit Hoogenboom

Scientist

Marit obtained her Bachelor’s and Master’s degree in Biomedical Sciences from the Leiden University. She did her PhD at the Erasmus Medical Center in Rotterdam where she focussed on DNA damage and the transcription stress response. Marit joined Toxys in 2020, where she will use her expertise to further develop novel toxicity assays.

José Manuel Horcas Nieto

Scientist

José holds a Bachelor’s degree in Biochemistry from Córdoba University and a Master’s degree in Drug Chemistry from Newcastle University. He obtained his Ph.D. at Groningen University, where he focused on developing in vitro and in silico models to study diseases affecting both peroxisomes and mitochondria. During his Ph.D., José worked on establishing hepatic organoid models derived from both primary tissue and induced pluripotent stem cells (iPSCs). He integrated proteomics data from these in vitro models with kinetic models, enabling the prediction of metabolic responses across different pathways. In 2023, José joined Toxys, where he currently works as a Scientist in the R&D department of the Reprotracker team.

Jing Fang

Scientist

Jing studied MSc Applied Food Safety at Wageningen University and Research. She obtained her PhD at Wageningen University with the PhD thesis entitled “Use of new approach methodologies to study the developmental toxicity of polycyclic aromatic hydrocarbons”. Jing joined Toxys as a scientist in ReproTracker team in 2023.

Gaonan Zhang

Associate Scientist

Gaonan obtained her first BSc in Agriculture from Shenyang Agriculture University and her second BSc 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 ReproTracker, ToxTracker and other mechanistic toxicity assays for our sponsors.

Tom Zwetsloot

Associate Scientist

Nynke Moelijker

Associate Scientist

Marleen Feliksik

Associate Scientist

Liesanne Wolters

Associate Scientist

Tom Zwetsloot

Associate Scientist

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

Associate Scientist

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.

Marleen Feliksik

Associate Scientist

Marleen obtained her Bachelor’s degree from the Leiden University of Applied Science in Biology and Medical Laboratory Research. Before joining Toxys, she worked at Leiden University as a technician, where she performed research on development of in vitro models for mammalian embryogenesis. Marleen joined Toxys in 2021 and she will be applying her knowledge on stem cells and cell culture to the ReproTracker assays.

Liesanne Wolters

Associate Scientist

Liesanne obtained her Master’s degree in Bio Pharmaceutical sciences from Leiden University. After obtaining her master’s degree, she worked as a technician at Leiden University, where she performed project based research using the HepG2 BAC-GFP reporter technology. Liesanne joined Toxys in 2020 as a technician to support the commercialisation of HepG2 BAC-GFP reporter technology within Toxys.

Connor Philippo

Assistant Scientist

Marije Meijer

Assistant Scientist

Eva de Tombe

Assistant Scientist

Glenn Bohms

Assistant Scientist

Connor Philippo

Assistant Scientist

Connor obtained his master’s degree in molecular genetics and biotechnology at University Leiden at the Genomic Stability Department. During his internship, he studied CRISPR/Cas9 induced double strand break repair. Connor joined Toxys in 2023 where he performs the ReproTracker assay for customers.

Marije Meijer

Assistant Scientist

Marije obtained her Bachelors of Life Science at the University of Applied Sciences Leiden. Previously, she worked at the OIE Reference Laboratory for Leptospirosis (also known as Expertise Centre for Leptospirosis) as a technician. In 2022, Marije joined Toxys where she has been performing ToxTracker and other mechanistic toxicity assays for our sponsors.

Kim Elbertse

Assistant Scientist

Kim obtained her Bachelors and Masters degree in Biopharmaceutical Sciences at Leiden University. During her internship she worked on the development of TCR T-cells for adoptive T-cell therapy in nasopharyngeal carcinoma at the Erasmus Medical Center. Kim joined Toxys in 2022 as a technician, where she performs the ToxProfiler assay.

Eva de Tombe

Assistant Scientist

Eva obtained her Bachelors and Masters degree in Bio-Pharmaceutical Sciences (Drug Discovery and Safety specialization) at Leiden University. During her thesis internship, she investigated the mechanism of bile salt induced apoptosis in cystic fibrosis with mouse cholangiocyte organoids at the Erasmus Medical Centre in Rotterdam. During an earlier internship, she worked on the development of multicolor HepG2 BAC reporter cell lines at the Leiden Academic Centre for Drug Research (LACDR). In January 2023, Eva joined Toxys as an assistant scientist performing the ToxTracker assay as well as other cell-based toxicity tests.

Glenn Bohms

Assistant Scientist

Glenn started working at Toxys in 2023 and has joined the Tox tracker team. Before this he obtained his master’s degree in Life science and technology degree at the TU Delft. He has also worked in the Life science industry related to covid testing and covid vaccine development.

Esther Lam

Study Investigator

Mathyn Rijkers

Study Investigator

Jacqueline Blonk

Laboratory Manager

Marianne Brummelkamp

Office Manager

Esther Lam

Study Investigator

Esther joined Toxys in 2023 and is a Study investigator for the Reprotracker assay. She studied Biology and medical laboratory sciences at Hogeschool Rotterdam. After her graduation, Esther held the position of Research Technician at the Leiden University Medical Center, department of anatomy and embryology and after that she worked at Janssen Viral Vaccines.

Mathyn Rijkers

Study Investigator

Mathyn obtained his Master’s degree in Biomedical Sciences at Utrecht University. During his major internship, he studied the effects of micro- and nanoplastics on macrophages at the Institute for Risk Assessment Sciences in Utrecht. In February 2022, Mathyn joined Toxys as an intern for his minor internship, where he investigated the applicability of human skin S9 in the ToxTracker assay. In April 2023, Mathyn joined Toxys as a Study Investigator for the ToxTracker assay.

Jacqueline Blonk

Laboratory Manager

Jacqueline joined Toxys in 2023 as Laboratory Manager. She studied Biology and medical laboratory sciences at Hogeschool Rotterdam and she has 28 years of laboratory experience in various companies.

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 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.

Toxys Inc.

 

Dan Roberts

Director BD & Sales

Dan Roberts

Director BD & Sales

Dan Roberts has a MS from John’s Hopkins University and nearly 20 years experience in applied genotoxicity testing. He joined Toxys in 2022 and is stationed in the USA to help enhance customer support and business development in North America. Prior to joining the team, he has worked across various industrial sectors including contract research organizations, biotech companies, and the pharmaceutical sector. Dan remains actively engaged in scientific organizations (GTA, EMGS) and participates in expert working groups within the field of genetic toxicology (IWGT, GTTC).

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.