Five years later

YNET article published in 2007

The first rabbi to be ordained in Germany since the Holocaust is so worried about being identified as a Jew that he often wears a baseball hat over his skull cap. "It's a fact - it isn't smart to display I'm Jewish. This is a problem and we have to face it," German-born Daniel Alter, 47, told Reuters in an interview. He is worried about neo-Nazi attacks and says anti-Semitism in Germany - still tortured by memories of the Holocaust in which Nazis wiped out six million Jews - puts the growth of Jewish communities here at risk.
Continue reading: http://www.ynetnews.com/articles/0,7340,L-3353070,00.html

2012 article

One of the first rabbis ordained in Germany since the Holocaust has been beaten up on a Berlin street, prompting a seminary to advise its students not to wear skullcaps in public.

Daniel Alter, 53, was attacked in front of his young daughter after collecting her from a piano lesson on Tuesday after a young man asked him “Are you a Jew?”, said Berlin police.
...
The Abraham Geiger College in Potsdam, currently training 28 rabbis, said it had boosted security around the building as a result of the attack and was checking mail.

“We have also given guidelines to our students on how to behave so that they do not become victims of such attacks,” the college’s rector Walter Homolka told the Berliner Morgenpost.

“We have advised them not to wear their skullcaps on the street, but to choose something inconspicuous to cover their head with,” he said.
Continue reading: http://www.euronews.com/newswires/1641290-german-jewish-college-shuns-skullcaps-after-attack-on-rabbi/