He joined the faculty at Johns Hopkins University in 1993, was an NSF National Young Investigator (1994), an invited Professor at the EPFL (1995) and the University of Paris XIII (2001), and received the ASM Materials Science Research Silver Medal in 2001. He served as Chair of the Department of Mechanical Engineering (2007–2013) and editor of
Scripta Materialia (2004–2011). Hemker was a member and vice-chair of the
DARPA Defense Science Research Council (2010–2014), a member of the SRI Technology Council (2017–2019) and was the 2018 President of The Minerals, Metals, Materials Society (TMS). He is currently a member of the
HRL Technical Advisory Group and the NCMS AMMP Advisory Council. Hemker has been named Fellow of AAAS, ASME, ASM International and TMS. Hemker has mentored over 75 postdoctoral fellows, doctoral and masters students since coming to Hopkins, about 20 of whom now have tenured or tenure-track academic positions in major research universities (
U Penn,
UIUC,
UCSB,
Tohoku U,
U Freiburg,
KAIST,
TAMU, and others). == Research ==