Leah Ellis is cofounder and CEO at Sublime Systems, a company that has developed a breakthrough process to produce low-carbon cement. Sublime’s technology was co-invented by Leah and Sublime's co-founder, Yet-Ming Chiang, at MIT’s Department of Materials Science and Engineering during Leah's tenure as NSERC/Banting Postdoctoral Fellow. Prior to working on cement at MIT, Leah earned a PhD in chemistry with Professor Jeff Dahn at Dalhousie University, Canada, where she worked on optimizing lithium-ion lifetime and energy density in partnerships with 3M and Tesla. Leah is an Activate Boston Entrepreneurial Fellow and was recently named among MIT Technology Review's 35 Innovators under 35.