The name of the shop is Marcel Hess. You are correct, his charcuterie and his pates are indeed world-quality and I purhase them frequently. As to the other dishes he offer...let's just say not my 350 grams of beef.
Hess is indeed kosher. Whether he is certified as glatt kosher* is not known to me.
*Glatt is a level of kashrut approval. It relates specifically to meat and involves an examination of the lungs of the animal immediately after slaughter. Only if the lungs are unscathed and unscarred can be meat be given that higher level of approval. With the exception of partiularly observant Jews the issue of glatt has relatively little impact. It might also be noted that while many restaurants featuring only glatt kosher meat do not present especially appealing culinary offerings.