Emeritus Professor Biochemistry; Rhodes University; Grahamstown; South Africa.

Honours Professor, Graduate Institute Applied Science; National Taiwan University Science & Technology.

Adjunct Professor in Enzymology, South China University Technology, Guangzhou.

Keynote lecturer in Japan, Korea, Taiwan, Singapore, India, China, United states, United Kingdom.

Visiting Research Scientist, Department Chemical Engineering, National Taiwan University, Taipei.

Visiting Professor Biochemistry, Biomedical Technology & Veterans Hospital, Yang Ming University, Taipei.

Visiting Professor of Enzymology & Organic Synthesis, Oregon State University, Corvallis, Oregon, USA.

Visiting Professor of Organic Synthesis, University British Columbia, Vancouver, Canada.

International Brain Research Organisation (IBRO).

South African Neuroscience Society (SANS).

International Society Neurochemists (ISN).

South African Society BiochemistryMolecular Biology (SASBMB).

Executive Member of Royal Chemical Society (London), MRSC (C.Chem).

South African Chemical Institute, MSA. Chem. Inst.

Editorial Board: Journal of Enzyme Inhibition, Journal of Medicinal Chemistry, Applied Microbiology & Biotechnology, Enzyme Microbiol Technology, Biotechnology Letters.

Publications of 6 book chapters, 110 peer-reviewed papers on Biomedical Enzymology and Nanomaterials.