Petra graduated in Leiden in 1989. She started her career as a lawyer at NautaDutilh. In 2011 Petra set up her own law firm, specialising in employment law. Lanser legal profession has an informal alliance with Sørensen Advocaten, situated at the same address with adjacent office spaces. From the same background, the quality is optimally worked on, including through the exchange of expertise. The high quality standard is the common denominator.