Sorry, I can’t click the link to see which Rosh that is
The Rosh refers to Rabbi Ezra Schochet, rosh yeshiva of the Lubavitcher yeshiva in LA. He's the son of Rav Dov Yehuda Schochet, with deep family ties to Telz. He himself learnt in NY, BMG, and Brisk before coming to Lubavitch. The story goes that the Gedolei HaDor at the time in the Litvishe world were less than thrilled when he left. The Schochet family is known to be the yekkes of Lubavitch, having grown up in Switzerland and the Netherlands.
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@AsherO: good bot)