Tatu got his PhD in Pharmacy from University of Helsinki in 2016. He works on drug delivery to challenging target sites, for example posterior segment of the eye, tumors and central nervous system. Tatu has diverse international research background through working in Santen Pharmaceuticals in Japan as well as Kyoto University and Tokyo University of Pharmacy & Life Sciences. He holds a shared position in University of Helsinki and University of Eastern Finland. The current focus of his research is the utilization of nanoparticle drug delivery systems for targeted treatment of diseases with biomacromolecules. With the help of his international network of collaborators, the work continues to progress the field towards better medications.