Kelley, Drye & Warren lost about 25 percent of its Chicago office to Chicago newcomer K&L Gatesthis week. Partners David Rammelt and Susan Greenspon, along with one of counsel and three associates made the jump. Greenspon will join the corporate practice group, while the other five will all be part of the commercial dispute practice group.

K&L Gates LLP is a US law firm with over 1700 attorneys worldwide, and is ranked as the 10th largest law firm in the world.