Who we are

Yellow Tree is passionate about the environment and about serving others. We are a team of Chemical Engineers that specialise in stack emissions testing, and we love our work.

Who we are

Our awesome staff are here to serve.

Caitlin Morris

Caitlin Morris

Senior Chemical Engineer

BSc Chem Eng, LLM in progress

Cait is a superb chemical engineer! She is incredibly bright and her work is flawlessly accurate. Cait has extensive knowledge of the legislation and of solutions to reduce air pollution. She writes simple and clear reports for our clients.

Matthew Mwepu

Matthew Mwepu

Senior Scientist and Trainer

NDip Mech Eng

Matt is one of our most experienced Stack Scientists. With a wealth of knowledge spanning the sampling of all emissions from particulate matter through to dioxins and furans, Matt is our guy! We love his confidence and bold leadership!

 

Rumbi Zireva

Rumbi Zireva

Air Quality Consultant

BSc Chem Eng, MSc Med, LLM in progress

Rumbi is both incredibly bright and dedicated. As a talented chemical engineer (with a Masters degree) she heads up our consulting department performing AEL applications, carbon tax consulting, NAEIS submissions, and implementing our ISO 17025.

Alen Siwela

Alen Siwela

Scientist

NDip Chem Eng

Alen’s life is characterised by perseverance and his story is inspirational. Having lost his parents at a young age, Alen fought to put himself through higher education. He is bright and has the courage that makes a stack scientist exemplary.

Ray Slinger

Ray Slinger

Senior Scientist and Trainer

BSc Environmental Science

Ray is effervescently joyful. His excellent communication skills,
warmth and professionalism make him a Yellow Tree ambassador of whom we are very proud. They say that one should lead with the heart of a servant, and serve with the heart of a king. That is Ray!

Ernest Kanyeta

Ernest Kanyeta

Scientist

NDip Chem Eng

At Yellow Tree we want bright engineers who also have grit! Having graduated top of his class at CPUT and overcome many challenges in life, we have found such an individual in Ernest! His enthusiasm can not be extinguished.

Khumbu Badantswana

Khumbu Badantswana

Senior Scientist

NDip Chem Eng

Khumbu is our genius. He is the first to solve a problem when sampling a boiler or process stack. His quietness belies his confidence and his friendliness. We are blessed to have him head up our Johannesburg team.

Monique

Monique

Admin, Health, and Safety

Nebosh

Monique is passionate about safety and about protecting the people that work at Yellow Tree. She has always protected others and placed the needs of others above her own. She is loyal and kind and we are excited about her future.

Sean Charteris

Sean Charteris

Managing Director

PR Chem Eng

Sean is a professionally registered Chemical Engineer with a wealth of experience in combustion, energy generation and industrial emissions. He is passionate about the environment and loves people.

Sakhumzi Baliso

Sakhumzi Baliso

Lab and QC Manager

NDip Analytical Chemistry

Sakie is one of our best! With years of emissions testing experience, he now oversees our laboratory, our field equipment and adherence to US EPA methods. His smile is contagious and lights up the room!

Sherri Mason

Sherri Mason

Engineering Manager

BSc Mech Eng

Sherri received innumerous accolades when working as the Systems Engineer of the Electrostatic Precipitators and SO3 Plant, at Eskom’s Grootvlei Power Station. She brings maturity, experience and a quiet authority to the Yellow Tree team!

Riyaal Cerpath

Riyaal Cerpath

Scientist

BSc Chem Eng

As a graduate chemical engineer who was head student of his residence, with academic colours from Maritzburg College, Riyaal has a rock solid work ethic and is a considerate and thoughtful leader. Riyaal has a bright future in the field of Air Quality.

Grant Derrick

Grant Derrick

Instrumentation Engineer

NDip Elec Eng

Grant’s never-say-die attitude and can-do ability to solve problems, make him an indispensable asset to the Yellow Tree Team. Grant looks after Yellow Tree’s highly technical air quality and stack sampling equipment.

Francois Duvenhage

Francois Duvenhage

Business Development

 

Francois is sincere and relational. His caring manner coupled with his determination to serve clients with beneficial solutions, make him a superb bridge between clients and Yellow Tree’s services.

NLA Certified

We are certified with the National Laboratory Association of South Africa. This ensures that we are accredited to test your stack emissions. If you would like to learn more, visit the NLA website here.