What about Dan Clark?

You don't see anything about Dan Clark so...now you're speculating that there's a problem? FFS, man, try the search bar.

Not sure if I see it as a problem. I am interested in a set of closed back headphones. I see Dan Clark makes a couple of models of closed back. 

Try hopping on one of these threads: 

https://forum.audiogon.com/search/index?utf8=%E2%9C%93&query=dan+clark+headphones

A number of years ago, when i was contemplating new phones (I have Stax 007 phones, I looked at Dan Clarks’ electrostatic models and Stax’s SR 009 phones.  I preferred the Dan Clark model because it was not as lean sounding as the Stax phones (on the Blue Hawaii SE amp I own).

If you want to know about headphones, I'd suggest going to a forum like head-fi - there is not much action on this particular one compared to that....  I guess most A'gon people don't do cans, or at least talk about 'em.