Leah Ellis

Sublime Systems, Inc. is a company based in Somerville, MA that was founded by Leah Ellis and has had her as the CEO since incorporation. Cement built the modern world, and Sublime will keep us building for the next millennium. The company is commercializing a breakthrough process to make low-carbon cement that performs like the cement we are used to, without the environmental cost. The company's process forgoes the kiln entirely, which is the most energy and fossil fuel-intensive part of the cement manufacturing process. The company's product replaces today's cement with no compromises and is available by the metric tonne in 2023. The company is working with infrastructure owners, engineers, architects, contractors, and ready-mix concrete plants to ensure their cement performs. The company's electrochemical process delivers a deep reduction in CO2 emissions, with a clear path to zero emissions in the future.

Greentown Labs operates as a community of climatetech and cleantech pioneers working to design a more sustainable world. The company was founded in 2011 and is headquartered in Somerville, MA.