Decades of hands-on experience in all forms of processing and printing, including the highly respected Kodak Dye Transfer, means Dennis is able to draw on a great wealth of photographic printing knowledge. Today he is known as a master black and white hand printer and continues to print for photographers, artists, collectors, galleries and museums around the world. In 2008 he was presented with the Sony Profoto Lifetime Achievement Award for his contribution to photography.

For many years Dennis was on the advisory committee for a previously disadvantaged photographic school, the Market Photo Workshop. He holds an Honorary Fellowship from the Professional Photographers of South Africa (PPSA) and is on the management team of the South African Professional Photographers (SAPP), serving as the Facilitator of Accreditation and Judging. Dennis has been a judicator in many prestigious photographic awards both locally and internationally, including the prestigious Sony Photographic Awards.

Janus is the co-founder of The Alternative Print Workshop and an accomplished photographer and darkroom printer in his own right.
Since 2014 he has been manufacturing darkroom and historical process chemistry for the Sub-Saharan continent. He taught photography full-time at Vega School and City Varsity, part-time at the Vaal University of Technology, and has lectured at most universities and colleges in South Africa.

Presently he is devoting most of his time at the APW as well as completing his MA in History of Art at the University of the Witwatersrand. He holds an Advanced Diploma in Higher Education (UFS), B-Tech Photography (VUT) and a hons degree in History of Art (Wits). He is on the advisory committee at the Bensusan Museum of Photography, and is on the management team of the South African Professional Photographers (SAPP), serving as the Manager of Education.