Mattijs Siebinga graduated in 1989 with an MSc in Mine Engineering from Technical University Delft, The Netherlands. From 1989 to date he has worked at Royal Boskalis Westminster, first as a Geotechnical Engineer and from 1992-95 as an Estimator. In mid-1995 he was appointed Project Engineer until in early 1997 he became Regional Manager for Westminster Dredging in Warri, Nigeria. In 2001 he transferred to Australia as Operations Manager for WestHam Dredging Pty Ltd in Sydney and in 2002 he became Managing Director of Boskalis Australia Pty Ltd where he is presently located.