Marcus has over 12 years of technical laboratory experience. His first three years involved working within the Millennium Group (Tree Ring Research Thematic) based in the School of Geography at Swansea University. The role involved measuring and cutting tree rings from tree core samples covering the last millennia, chemical extraction of cellulose from the wood samples for analysis of the variability of the heavy isotopes carbon and oxygen using an elemental analyser combined with a mass spectrometer. The next four years he worked on the BEACON project within the Medical School at Swansea University. The aim from the project was to link industry with scientific research under the theme of 'Bio-refineries'. Within this role he developed techniques in cellular and molecular biology, microbiology, microscopy, biochemistry and analytical chemistry (mainly in gas chromatography mass spectrometry). He is currently working on the BEACON+ project which is building on the success of the first BEACON project where scientists from Aberystwyth, Bangor and Swansea universities are collaborating with industry to develop renewable materials, fuel and chemicals. The aim of BEACON+ is to create over 100 new products or processes in partnership with businesses.