Holar has been working with isotope ratio mass spectrometry since 2009. His experience covers a wide range of analytical applications across geology, biology, environmental science, and archaeology. He is responsible for stable isotope measurements, as well as for laboratory management and the maintenance and repair of IRMS instrumentation. In the FORAGER project, his role is to ensure the technical operation of GC-C-IRMS measurements at the University of Tartu.