• I have compiled a list of open problems related to copositivity (and complete positivity) which is available here.
  • I received the Educational Prize (Teacher of the Year) 2017/2018 from S.A. Astatine (the study association of Advanced Technology and Nanotechnology at the University of Twente).
  • My article Erratum to: On the DJL conjecture for order 6 has been publish in Operators and Matrices. In this article two errors are demonstrated and corrected from the paper "On the DJL conjecture for order 6" by Naomi Shaked-Monderer, previously published in Operators and Matrices.
  • The article A fresh CP look at mixed-binary QPs: New formulations and relaxations by myself, Immanuel Bomze, Jianqiang Cheng and Abdel Lisser has been published in Mathematical Programming. In this article we look at completely positive formulations of (nonconvex) binary quadratic problems. We observe that although Slater's condition does not hold in the primal problem, there are simple sufficient conditions for Slater's condition to hold in the dual (copositive) problem.
  • A few years ago I started a poll on what notation should be used for the copositive and completely positive cones. This poll is still open at, and currently (as of 31/10/2017) by far the most popular notation is COP (\mathcal{COP}) for the copositive cone and CP (\mathcal{CP}) for the completely positive cone.
  • I have now started a new poll on what notation should be used for the doubly nonnegative cone and its dual, which is available at

Short biography

I was born in London in 1985, however I grew up mainly in Croxley Green, which is in a beautiful area on the outskirts of London. As an undergraduate I studied at Queens' College, University of Cambridge, where I received an MSc in Natural Sciences in 2007. After this I spent about nine months travelling around Australia, working primarily in bars and as a scuba diver. During this time I met the woman who is now my wife and mother to my child, Renske Bosman. From May 2009 until April 2013 I studied as a PhD student in Mathematics at the University of Groningen, with the Systems, Control and Applied Analysis Research Programme. My supervisor during this was Prof. Dr. Mirjam Dür. I defended my PhD thesis on Friday 12th April 2013, receiving a cum laude distinction. This distinction is only awarded to the top 5% of PhD theses. From May 2013 until February 2014 I had a Post Doc position at the University of Vienna, with Prof. Dr. Immanuel Bomze as my mentor. From April 2014 until July 2018 I was an Assistant Professor at the University of Twente.