Casimir is a newly qualified associate in the Disputes and Family team.
During school Casimir was awarded caps and colours in cricket, rugby and hockey captaining his school 1st eleven cricket and hockey teams. He had trials for Somerset County in cricket and rugby and received the award for Most Outstanding Sporting Achievement is his final year at school. At university Casimir continued to participate in as much sport as possible representing the university 3rd hockey X1 and the university 1st XV rugby team. During the summer of 2010, Casimir was part of a 10-man team that ran the Lewa Half Marathon in Kenya raising a substantial sum of money for Tusk Trust and the Henry Van Straubenzee charity. He stayed on in Kenya for another month working with an anti-poaching unit in the north of the country.