Established in 1997, Yes Oui Si Ltd. has an excellent record of delivering quality services to blue chip companies including Vodafone, CSC and IBM.
Yes Oui Si is committed to measuring, managing, reducing and reporting on the environmental performance of organisations that operate in commercial office space. Our solutions are based around a solid engineering expertise of how buildings operate. Only with that engineering emphasis can we develop successful strategies and integrate the softer skills of staff engagement.
David Collier, Founder and Managing Director
David has worked in the energy and utilities sector for over 25 years. He has an exceptional track record of delivering significant savings across a diverse range of non-domestic properties, and combines his data analysis abilities, building services knowledge and occupier engagement skills to reduce energy consumption on all fronts.
David is a recognised expert in his field and regularly speaks at events including both the Energy Event and Sustainability Live event at NEC.
David holds a Sustainable Energy Futures MSc from Imperial College, a Mechanical Engineering BSc from the University of Nottingham and is a Chartered Engineer and member of CIBSE and a Chartered Energy Manager and member of the Energy Institute. He is also a Certified Infrared Thermographer and a Qualified ISO 50001 Lead Auditor.