We set out to develop tools and reagents that provide reproducible cell based assays.
Defined began its journey to transform the stem cell media by understanding the most critical stem cell research needs - cell growth quality, cost, and ease of use. To meet the growing demands of various customer segments, we realized that we would have to optimize all of the fundamental ingredients of defined growth media: growth factors, proteins, buffers, and growth/differentiation analysis.
We have developed innovative reagents across traditional recipes, leveraging published and optimized recipes from leaders in the field. The result is exceptional reagents, media, and protocols that will materially improve quality and reduce the cost of growing stem cells and iPSC derived cells, organoids, and their applications.
Meet Our Team

Steve Rees, PhD
Co-Founder, CEO

Jerome Karpiak, PhD
Co-Founder, VP of R&D

Jose M. Morachis PhD
Founder and Board Chairman

Will Alaynick, PhD
Founder and Board Member

Maria Mozo
Research Associate

Gerardo Aguirre
Stem Cell Biologist

Rebecca Pierce
Research Technician

Fiona Chou, MBA
VP of Finance
Meet Advisory Board
Discover more in our FAQ
Who is Defined Bioscience?
Who is Defined Bioscience?
Defined Bioscience is a life science tools company focused on creating chemically defined, animal-origin-free media, supplements, and reagents that enable breakthrough research and clinical translation. Founded by scientists and entrepreneurs with deep experience in stem cell biology, regenerative medicine, and biomanufacturing, Defined Bioscience supports academic researchers, biotechnology startups, and pharmaceutical companies worldwide.
What are Defined Bioscience’s main product offerings?
What are Defined Bioscience’s main product offerings?
Defined Bioscience specializes in producing chemically defined, feeder-free media, supplements, and reagents for stem cell research, including human induced pluripotent stem cells (hiPSCs), embryonic stem cells and other mammalian cells. These products are optimized for high reproducibility and consistent cell growth across various applications. In addition, our ingredients are ‘open label’, so you know what you are adding to your cells.
Who are our products for?
Who are our products for?
We design our products for:
- Academic researchers seeking open-label formulations to publish reproducible science.
- Biotech and biopharma teams advancing cell therapies, regenerative medicine, and drug discovery.
- Core facilities and CROs that need consistent, standardized results across users and projects.
- Cultivated meat innovators who require species-specific, animal-origin-free formulations for scalable cell culture.
Are Defined Bioscience products animal-origin free?
Are Defined Bioscience products animal-origin free?
Many of our products, including the HiDef-B8 medium and supplements such as FGF2-G3 and HiDef-ITS, are fully animal-origin free. This ensures that they are suitable for both basic research and translational applications where the absence of animal-derived components is critical.