As the leading principal scientist for Group IV epi activities he defines and coordinates the epitaxial growth strategy to address current and future material requirements for semiconductor applications. Roger holds more than 85 patent applications (including provisional filings), he (co-) authored more than 240 papers (listed in INSPEC database) and he is co-editor of seven special journal issues (Semiconductor Science and Technology (2019), Materials Science in Semiconductor Processing (2017), Thin Solid Films (2012, 2016), Solid State Electronics (2013, 2015), and Micro Electronic Engineering (2014)). His h-factor is 33.