in moment we will welcome professor mark dollinger. >>> good morning. and welcome back to mosaic. i am rabbi eric wipes and we are going to intro cues you to a history professor at san francisco state university. welcome professor macmarc dollinger. >> great to be here. >> you wrote a book called black power jewish politics reinventing the alliance of the 1960s. so, that's a potent title. >> yeah. >> so, let's just jump in as an academic, you have just a lot of freedom to choose what you write about and the content you put in to something and let's start at the beginning and ask you how did you arrive to this particular topic? >> this is somewhat embarrassing story. from my very first week at cal berkeley as a freshman i was raised in the los angeles suburbs of 1970s and learned about jewish social justice what is to repair or heal the world, and we learned about dr. king, and we learned about the civil rights movement, the march from selma. i was excited to arrive at berkeley. i signed up and the second stop for mow of course was the black student union table. and i walked up and