2020 -

Professor of Pharmacognosy, KNUST.

2014 - 2020

Associate Professor of Pharmacognosy, KNUST.

2014-to date

Visiting Associate Professor, Department of Pharmacognosy, Faculty of Pharmacy, Madonna University Elele, Port Harcourt, Nigeria.

2012

Visiting Scientist, Department of Pharmaceutical and Biological Chemistry, University College of London, School of Pharmacy, United Kingdom.

2009 to 2014

Senior Lecturer, Department of Pharmacognosy, Faculty of Pharmacy & Pharmaceutical Sciences, Kwame Nkrumah University of Science & Technology, Kumasi, Ghana.

2009 to 2014

Visiting Senior Lecturer of Pharmacognosy to the Faculty of Pharmacy, Madonna University Elele, Port Harcourt, Nigeria.

2008-to date

Examiner, Department of Herbal Medicine, Faculty of Pharmacy & Pharmaceutical Sciences, Kwame Nkrumah University of Science & Technology, Kumasi, Ghana.

2000-2008

Lecturer, Department of Pharmacognosy, Faculty of Pharmacy & Pharmaceutical Sciences, Kwame Nkrumah University of Science & Technology, Kumasi, Ghana.

2000-to date

Examiner, Department of Pharmacognosy, Faculty of Pharmacy & Pharmaceutical Sciences, Kwame Nkrumah University of Science & Technology, Kumasi, Ghana.

2005-2007

Demonstrator, Department of Pharmaceutical Microbiology, King’s College London, University of London, United Kingdom.

2003-2007

Demonstrator, Department of Pharmacognosy, King’s College London, University of London, United Kingdom.

1996-1999

Teaching Assistant and Demonstrator, Department of Pharmacognosy, Faculty of Pharmacy & Pharmaceutical Sciences, Kwame Nkrumah University of Science & Technology, Kumasi, Ghana.