Sanni Oluwaseyi was born in Lagos in 1983. He received the B.sc degree in Biochemistry from Olabisi Onabanjo University, Ago Iwoye, Ogun state, Nigeria, in 2008.
He joined Manola Pharmaceuticals a sister company to L'PaceMakers Pharmaceuticals as a Business Development Executive (Oncology) in 2010 -2012.
In 2014 he joined Excel Charis Pharmaceuticals as one of the three pioneering Medical sales Representative (Oncology) for the company and rose to the position of a Regional Sales manager spanning from Lagos to North Central in 2016.
In 2018, He was moved to Head (Marketing Manager) Global Oneword Pharmaceuticals Limited a sister company to Excel Charis Pharmaceuticals Limited.
In 2019, He Joined Procidos Pharmaceuticals Limited as a Portfolio Manager (Oncology) and later Superior Pharmaceuticals Limited as a Regional Sales and Business Manager for Lagos and Ogun state.
Sanni Oluwaseyi is a member of the Nigerian Institute of Management (NIM).