CEO Message

ReproCELL is going to continue challenging the new horizon of the ES/iPS cell business as a pioneering company

REPROCELL is a biotech company that was established in 2003 on the basis of technologies developed by Professor Nakatsuji (who had established the first human ES cells in Japan in that year) at Kyoto University and Professor Nakauchi at Tokyo University. The first human ES cells were established at Wisconsin University in 1998, and the first human iPS cells were established at Kyoto University in 2007. Human ES/iPS cell research is still in its early stages, but it is expected to lead to the next generation of life science businesses such as regenerative medicine, tailor-made medicine, and drug development support.

REPROCELL has been playing a pivotal and pioneering role in the ES/iPS cell business by starting to commercialize culture media for human ES/iPS cells in 2005, the world’s first cardiomyocytes derived from human iPS cells in 2009, and the world’s first neurons derived from human iPS cells in 2010. We will continue expanding our business in the field, including the development of culture reagents, stem cell-based drug development support technologies, and tailor-made medicine.

REPROCELL'S company policies are “customer centeredness,” “faith and trust,” and “a frontier spirit.” We believe that the company can exist only by providing value to customers and contributing to society. Toward this purpose, REPROCELL places emphasis on faithfully and bravely taking up new challenges. Through our business, we will contribute to the health and happiness of people worldwide.

Chikafumi Yokoyama
Chief Executive Officer

REPROCELL Board Of Directors Biographies

Chikafumi Yokoyama, Ph.D.

Chief Executive Officer

Dr. Yokoyama joined REPROCELL Inc. in 2004 as a general manager of the business development division and became Chief Executive Officer in 2005. He has been responsible for new product management, alliance, and fund raising. He also participated in establishing a Stem Cell and Drug Discovery Institute in which human ES cell research is carried out for the purpose of drug discovery and toxicity testing applications. From 1996 to 2004, Dr Yokoyama worked for McKinsey and Company Inc. as a management consultant and then for Sumitomo 3M, a subsidiary of 3M, as an R&D leader. He received his Ph.D. in chemistry from Tokyo University in 1996.

Daisuke Usui

Director, CFO

NOF Corporation
HOYA Corporation
Reinnervate Limited CEO(current occupation)

Mr. Daisuke Usui has global experience in key business position of medical and biotech companies in mature and emerging markets. His diverse background includes various roles managing finance, sales and marketing, supply chain, and launching new products. Prior to joining REPROCELL, Daisuke was responsible for sales and commercial activities in Asia Pacific with HOYA Surgical Optics, in addition to being an executive manager for its subsidiary in India. Daisuke holds a bachelor of arts (International Studies) from Tsukuba University (Japan).

Yoshiyuki Yamakawa


Mr. Yamakawa has been a non-executive director of ReproCELL since 2008. He is the CEO of HIBIKI Partners, a consulting company, and a BOD member of some listed companies. Having graduated from Waseda University in economics, he started his career as a venture capitalist at Nippon Life Insurance. After experiencing directorship of corporate planning at Innotech Corporation, Mr. Yamakawa joined Sosei Co. Ltd. in 2001 and succeeded in its IPO and M&A as a representative executive officer and CFO.



Rama Modali


NIH(National Institutes of Health)
National Cancer Institute
BioServe Biotechnologies, Ltd. CEO(current occupation)

Rama is the CEO of REPROCELL USA. Rama Modali is also the founder and president of BioServe. For years, Rama has spearheaded our efforts to develop and provide advanced molecular biology services to pharmaceutical, academic and government institutions. With more than 30 years’ experience in molecular biology, Rama continues to guide successful growth, international expansion and provision of cutting-edge scientific applications to enhance our customers’ research.

Prior to becoming REPROCELL USA’s CEO and founding BioServe, Rama worked as a molecular biologist at the National Institutes of Health and National Cancer Institute. He has over 32 peer reviewed research publications.


David Burton


Glasgow Caledonian University
Biopta Limited CEO(current occupation)

Dr. David Bunton is CEO of REPROCELL Europe, a life sciences company based in Glasgow, UK, and a subsidiary of REPROCELL Inc. Having founded a human tissue assay service company (Biopta Ltd.) in 2002, Dr. Bunton later took over as the CEO of the conjoint REPROCELL Europe business after the acquisition of Biopta by REPROCELL. The company remains focused on the use of human fresh tissues, 3D models and the use of iPSCs to better characterize drug efficacy and inter-patient variability in drug responses.

Previously a Lecturer at Glasgow Caledonian University, David has numerous publications in physiology and pharmacology to his name and is a respected opinion leader in the use of human tissue for drug discovery. He chairs the Scottish Lifesciences Association’s special interest group in precision medicine, is a member of the NC3Rs/MHRA working party on human tissues in safety pharmacology and is an advocate for the wider global use of human cells and tissues in drug development.