Our team members

Our team consists of highly qualified and motivated professionals, who are all experts in their field. With many years of experience in the industry, they have the expertise to provide comprehensive, first-rate services to our clients.

Stephen Preston

Company Principal

40 years in the international water industry and still going strong. Stephen established Waterframe and the WSO Global group in 2005 and continues to be a driving force and guiding light for our worldwide operations. 

Guido Wiesenreiter

Director - SE Asia

Guido, an Austrian national, has highly developed water loss management expertise gained in Asia, Africa, Eastern Europe, South and North America. He is responsible for the successful implementation of holistic NRW projects as well as comprehensive NRW studies including full scale water audits. He has been with WSO since 2005 and has been resident in Malaysia since 2009.

Peter Jinks

Director - USA

Peter has been with WSO global since the beginning. Currently based in Guam where he is delivering the GWA water loss control program, Peter has been working in the water industry since 1980. He has wide-ranging experience in all aspects of water supply and distribution networks, especially design and construction of repairs and installations on a water distribution system. A great trainer and not afraid to get out on site with the operations staff.

Firdaus Abdullah

Project Director

After gaining his Bachelor’s Degree in Chemical Engineering in 2008 , Firdaus joined Syarikat Air Selangor (SYABAS), a key water company in Malaysia, as a Hydraulic Modelling Engineer. From 2013, he worked for CH2M Hill (M) Sdn Bhd on international projects In UK and Mauritius. Joining WSO April in 2015, he is now our key Project Director ensuring technical excellence and project delivery. 

Lamin Siamir

Senior Project Manager

Lamin has been working in the Malaysian water industry since receiving his Bachelor’s Degree in Mechanical Engineering in 2005. In addition to working on several non-revenue water projects in Sabah, he was employed by Pengurusan Aset Air Berhad in 2014 as a Senior Executive in the Project Planning Department where he was evaluating proposed CAPEX projects by water operators, including SAJ, SAMB and LAP. 

Siti Rogayah

NRW Monitoring Expert


Noriswarah Karmin

Hydraulic Modeller


Lee Man Hung

Project Team Leader


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