Bachelor of Science in Pharmacy, School Pharmacy, University Nairobi, Kenya, 1979. Master of Science, University London, 1984. Doctor of Philosophy, Katholieke University Leuven, Belgium, 2000.
Hospital pharmacist Kenyatta National Hospital, Nairobi, 1980—1983, chief pharmacist, 1984—1985. Research officer Kenya Medical Research Institute, 1985—2000, senior research officer Kenya, 2001—2004, principal research officer, since 2004, acting director, center traditional medicine and drug research, since 2008. Lead consultant, report pharmaceutical situation World Health Organization, Nairobi, 2003.
Consultant trainer drug quantification in Seychelles United Nations Development Program, Nairobi, 2005. Consultant drug registration Pharmacy and Poisons Board, 2005. Associate lead person, ethnobotany research Lake Victoria Research Initiative, Kampala, Uganda, since 2006.
Member National Council, Legal and Ethics Committee, Education Committee, 2004—2007. Member of International Network Rational Use Drugs (treasurer 2004-2008), Natural Products Research Network Eastern and Central Africa, Pharmaceutical Society Kenya (national council member 2004-2008).
Married Moses Wandaga Orwa, 1980. Children: Tabitha Owiti, Marianne Adhiambo, Michael Orwa.