David Calder is a Head of Finance (Chemical and Biological Treatment) and Acquisition Integration at RSE. He possess expertise in management, leadership, oil and gas, finance, mentoring. Colleagues describe him as "I worked alongside David for 2 years at the Global Energy Group offices in Perth, Australia, prior to his move to Dubai. David combines his proficiency in all corporate and financial matters with an infectious means of encouraging and developing those around him. David was key in establishing our presence in Asia Pacific and maintaining the personal relationships required to do so. Our continued growth is a direct consequence of his efforts. David is always on hand to offer friendship, advice and support beyond the call of duty. " and "David led Global energy group in the Asia pacific and the development and growth of the portfolio in the region was in no small part down to his strong leadership and direction. I thoroughly enjoyed working for David and personally developed a significant amount with his open honest approach to things and the support and mentoring he gave over a two year period."