Rosen was active in many areas. He helped implement technological innovations for halakhic observance at the Zomet Institute. These devices apply halakhic concepts to technological devices, mostly electronics, to enable using them within the rules of halakhah. He also wrote and published articles on Tanakh. His positions tended to be conservative both politically and religiously.[citation needed]
In April 2008, Rosen was awarded the Lev Prize by Machon Lev for outstanding achievement in Torah Umadda.
In November 2008, Rosen won a libel lawsuit against Yated Ne'eman (Israel) after the rabbinic board of Yated Ne'eman instructed its editors to slander him. Yated Ne'eman falsely claimed that the rabbi provided halakhic certification out of the desire for money.[1][2]
On the occasion of Pope Benedict XVI's 2009 pilgrimage to Israel, Rosen's far-from-endearing message to the Pope was that Jesus was a false messiah who deserved to die, but Catholics could be utilized to help Israel fight a war against fundamentalist Islam.[3]
In August 2017, Rosen, who served as member of The Jewish Home political party presidium, resigned from the party in protest of party's chairman Naftali Bennett employing a lesbian spokesperson.[4]
Rosen died on November 1, 2017 (13 Marcheshvan 5778).[5]
