Petra completed her law studies in Leiden in 1989. She started her career as a lawyer with the renowned law firm NautaDutilh. In 2011, Petra founded her own law firm named Lanser Advocatuur, which is specialized in employment law.
Lanser Advocatuur is part of an informal alliance with Sørensen Advocaten, based in Rotterdam in the same office building and in adjacent office spaces. They share a background of providing high quality legal services which enables Petra to perform at a very professional level, inter alia by exchanging specialized knowledge with the lawyers of Sørensen Advocaten. Quality is always key to all of them.