Santen Leadership Team

Our Executive Leadership Team for Santen Inc.—which covers the US and Canada—is connected by a shared passion for science, a deep level of industry experience, and an enduring commitment to improving people’s quality of life by restoring and preserving vision.


Tatsuya (Tats) Kaihara
Chief Executive Officer

Before assuming his current role in 2020, Tats served as Chief Strategy Officer and Financial Officer of Santen, Inc. and also Chief Investment Officer for Santen Ventures, Inc., our corporate ventures capital fund which invests in select ophthalmology innovation R&D projects and partners throughout North America.

Prior to joining Santen in 2017, Tats held various leadership roles in corporate planning, finance and technology at Astellas Pharma, Inc. – in the US, EMEA and Japan—over nearly a decade.

Tats lives in Layfette with his wife Yuko and their daughter.

Santen is developing therapies and solutions that can significantly help people with vision impairments lead their happiest life. This mission is at the heart of what we do every day and is shared by Santen employees around the world.


Masahiro (Mas) Inoue
Chief Administrative Officer

Since joining Santen in 2011 as Head of Asia, Mas has held several global leadership roles, including Managing Director of Santen Pharmaceutical Asia, and currently, Chief Administrative Officer of Santen USA.

Prior to Santen, Mas served as Corporate Officer and has held various senior leadership roles in pharmaceutical and related companies. Earlier in his career, Mas also worked in global strategy and commercial banking spaces.

Mas received his MBA from the Tuck School of Business and a Bachelor of Law degree from Keio University. He enjoys jogging, biking, and swimming when he is not busy with work.

We’re lucky being in the US so we can experience, see, and interact with other innovations and innovators around us…We feel we can be a fountain of innovation here.

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