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Constantin Ionel Stefan is the Chief Technology Officer at Amprius Inc, where Constantin Ionel has been working since November 2009. Before that, Constantin Ionel held the position of Scientist Electrochemist at Nanosys Inc. from May 2005 to November 2009. Prior to their industry roles, Constantin Ionel was a Postdoctoral Fellow at Lawrence Berkeley National Laboratory from September 2002 to May 2005. Constantin Ionel Stefan obtained their PhD in Chemistry from Case Western Reserve University in 2002.