Google isn't the whole internet,and a simple search that took 10 seconds could have avoided a whole unnecessary post as it immediately answered both questions that OP had.
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Grayboosh t1_iueztpd wrote
https://www.google.com/search?q=what+is+stephen+hawking+famous+for&oq=what+is+stephen+&aqs=chrome.1.69i57j0i512l8.5463j0j1&client=ms-android-verizon&sourceid=chrome-mobile&ie=UTF-8
You're suppose to do this before making an eli5