https://www.materialsdesign.com/about-us/stephen-j.-mumby%2C-ph.d. 2019-01-04 https://www.materialsdesign.com/about-us/erich-wimmer%2C-ph.d.- 2018-09-17 https://www.materialsdesign.com/about-us/clive-m.-freeman%2C-ph.d. 2018-09-14