Rocco Gasteiger submitted his Phd thesis today. Starting in 2007 and sometimes side-tracked by other projects he had to take care of, Rocco dealt with the exploration of measured and simulated blood flow data, comparing results, developing new exploration techniques, such as his FlowLens. In a close cooperation with Roy van Pelt and Anna Vilanova , Rocco developed techniques to quantify the flow with respect to the inflow jet and the impingement zone. Besides his two most essential papers that appeared at IEEE TVCG, another contribution of Rocco is extraordinary: a new approach to depict the vascular morphology and internal flow, published at the VCBM Eurographics Workshop in 2010 and being effectively the most heavily cited paper.