Klaas Nierop works as an analytical (geo)chemist at the Organic Geochemistry labs of the GeoLab. He advises bio- and geoscientists, technicians and students on analytical & organic chemical techniques. These include extraction, work-up/chemical degradation, and analysis of (paleo)environmental samples on GC-FID/-MS/-IRMS, HPLC-MS and pyrolysis-GC-MS, as well as on mass spectral identification and interpretation.