Add Patrick to speaker list and Q&A

Change-Id: Ia14a0c857a181bf6d04c96f6a038344e721b1391
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 * *[Edwin Kempin, Google](../*
 * *[Ben Rohlfs, Google](../*
 * *[Thomas Draebing, SAP](../*
+* *[Patrick Hiesel, Google](../*
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 and later became project manager for the SCM architecture transformation and
 enhancement of the company.
+### Patrick Hiesel - Google {#phiesel}
+Patrick joined Google and the Gerrit project in 2016, working primarily on the
+backend. Since then, he has worked on making Gerrit faster, and more stable as
+well as different features, including (most recently) Submit Requirements.
+He is a Gerrit maintainer and a member of the Engineering Steering Committee.