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
Senior Chemical Engineer
BSc Chem Eng, LLM
Cait is a superb chemical engineer! She is incredibly bright and her work is flawlessly accurate. Cait heads up our consulting department with her extensive knowledge of the legislation and of solutions to reduce air pollution.
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!
Xolani Gajule
Scientist
NDip Chem Eng
Xolani is a fast learner who exudes energy. Because of his tenacious spirit, no problem is too challenging for him. He is an adaptable team player and someone you can count on!
Alen Siwela
Scientist
Adv Dipl in 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
Business Development
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!
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!
Khumbu Badantswana
JHB Regional Manager
Adv Dipl Chem Eng & Management
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 Majendie
Finance and HR
Nebosh; ACCA underway
Monique is a strong, kind and authoritative leader who serves those around her sacrificially. She is resilient and we are blessed to have her caring for our people and stewarding our finances.
Sean Charteris
Managing Director
BSc Chem Eng
Sean is a 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
Scientist
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!
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.
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
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.
Ernest Kanyeta
Scientist
Adv Dipl in 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.
Weyers Marais
Team Leader
BTech Surface Design
Weyers is genuine, kind, authoritative – and a perfectionist in his work. He leads our team with care, and oversees the business on a daily basis. We sit confidently under his thoughtful leadership, as he guides our team to wholehearted client service.
Natali Nyabanga
Engineering Administrator
MEng: Chemical Engineering
Natali is intelligent, focused, and diligent. She cares for our stack sampling equipment, supports our Engineering Manager, and maintains our systems. We are excited about her future!
Aphiwe Gugushe
Laboratory Technician
MSc Chemistry
Aphiwe’s enigmatic nature and productive work ethic ensure that our internal Yellow Tree laboratory operates efficiently and at the highest accuracy. We are delighted to have Aphiwe in our precious team.
Matt Findlay
Chemical Engineer
BEng Chemical Engineering
Matt is a bright problem solver and possesses beautiful leadership abilities. As report writer and client liaison, he pulls together all of our departments. It is a privilege to have Matt in our team.
Kaveel Chatrooghoon
Scientist
BSc Enviro Science
If there is someone who gets things done, it is Kaveel! He has great mental stamina and a resilient spirit which lead to him facing challenges head-on. We love his calm and humble demeaner.
Nkosinathi (Smartie) Dube
Groundsman
Nkosi is a man of integrity and humility. He is the caretaker of our JHB premises and has faithfully been on the property since 2006. His nickname is “Smartie” because he knows all there is to know about gardening & maintenance. It is a privilege to have him on our team.
Sasha Kasperski
Chemical Engineer
Meng Chem Eng
Sasha is fastidious and diligent in her work – a true perfectionist – and of course, we want our clients’ data and reports to be perfect! She is willing, enthusiastic and observant. A true engineer!
NLA registered
We are members of the National Laboratory Association of South Africa. This ensures that there is accountability in our stack sampling work. If you would like to learn more, visit the NLA website here.