John Knowlton graduated with an Honours Degree in Chemistry from the University of Kingston
(England) in 1977. He spent six years in polymer research where he gained experience in
regulatory issues with the Federal Drug Administration in the USA.
In 1984, John entered the cosmetics and toiletries industry with Johnson and Johnson, where
he held various positions within the European Research & Development Division during his 10-
year stay with the company. This culminated in 1994, when he held the position of Principle
Scientist for Southern Europe, with responsibility for all technical issues associated with Johnson
& Johnson’s personal care business in that part of the World.
In 1995, John joined Justine, South Africa as Research Director, with overall responsibility for
research & development, quality assurance and regulatory affairs.
He left in the Avon Justine group in 1998 to start his own business, Cosmetic Solutions,
specialising in a wide range of consultancy services to the cosmetic industry. Outside of the
direct working environment, John has been very active over the last 15 years with many
scientific publications to his credit. He is a well known and much respected consultant to the
cosmetic industry in South Africa.
In 1992, he was President of the Society of Cosmetic Scientists of Great Britain and he has
presented papers on a wide variety of topics in many parts of the world. In 1993, he was coauthor
of the now well-established textbook, “The Handbook of Cosmetic Science &
Technology”. In 1999, John was President of the South African Society of Cosmetic Chemists.
DR JOHN HOPKINS
- Dr Hopkins has a BSc Honours degree in Biochemistry and a doctorate in Pharmacology and
Toxicology – both from the UK.
- He was a founding member of the British Toxicology Society in 1979, as well as a member of the
Institute of Biology.
- He holds a Diploma C Biol. Which is recognised under European Community law to be a Safety
Assessor for products under the Cosmetics Directive.
- Dr Hopkins practiced as a toxicologist for Smith Kline Beecham Pharmaceuticals in the early
seventies after which he joined Johnson and Johnson where he worked for for 24 years . He
has written a number of scientific papers and articles over the years.
- He now practices in the area of cosmetic safety, toxicology and risk assessment.
Hopkins J and Tudhope GR. Glutathione peroxidase in Human Red Cells in Health and Disease.
British J. Haematol. 25:563 (1973).
Hopkins J and Tudhope GR. Red Cell Glutathione in Anaemia. Scottish Medical Journal18: 177
Hopkins J and Tudhope GR. Glutathione Peroxidase deficiency with increased susceptibility to
erythrocyte Heinz Body formation. Clin Sci. & Mol.Med.47: 643 (1974)
Tudhope GR and Hopkins J. Plasma tocopherol levels and the susceptibility of Erythrocytes to
Heinz Body formation. Clin.Sci.& Mol.Med. 46: 635 (1974)
Tudhope GR and Hopkins J. Lipid Peroxidation in Erythrocytes. Acta Haematologica 51: 29
Hopkins J and Tudhope Gr. The effects of Drugs on erythrocytes in vitro. Brit. J. Clin. Pharmac.
Hopkins J. Baby Powder- exploring the Myths and Realities. Brit.J. Midwifery 9 (9) 545-547
Hopkins J. The safe and effective use of baby powder. RCM Midwives Journal 4 (9) 285-286
Bertin C, Zunino H, Pittet J-C, Beau P, Pineau P, Massonneau M, Robert C, Hopkins J. A doubleblind
evaluation of the activity of an anti-cellulite product containing retinol, caffeine and
ruscogene by a combination of several non-invasive methods. J.Cosmet. Sci 52, 199-210
Hopkins J. Baby Powder -dusting off the Myths. Chemist & Druggist, 15
th Dec 2001. pp 32-33 (2001).
Hopkins J. Heaven Scent – The safe use of fragrance in Cosmetics. Chemist & Druggist, 3