clamp- to hold something tightly, or to fasten two things together theres also a group of manga-ka artists called camp... :p

CLAMP are a group of manga artists who created many famous manga series like Chobits and Tsubasa RESERVoir CHRoNiCLE. They also made Cardcaptor Sakura, RG Veda, Magic Knight Rayearth, XxxHolic, Kobato and some others.

There is a list of CLAMP works below at the related link .

In a studio.

Tokyopop has a few manga artists in the US.

Mark Crilley, a popular How-to-draw manga artist and has a Youtube channel, has his own series.