Proskauer Rose LLP's Washington, DC-based practice is built for the most demanding defense-side mandates, combining trial capability with regulatory expertise across sectors ranging from agriculture and pharmaceuticals to sports, healthcare, technology and consumer products. The practice is co-led by Colin Kass, a veteran trial lawyer whose two decades of experience in class actions, competitor disputes and government investigations supports the group’s litigation strength. Alongside him, Christopher Ondeck stands out as an antitrust trial lawyer, having secured landmark defense verdicts. John Ingrassia brings seasoned judgment to major antitrust disputes, with a practice centered on large-scale class actions and multidistrict litigation. Mark Rosman is a figure in the firm’s MDL bench, regularly acting in high-profile antitrust proceedings and follow-on claims.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Sector knowledge
Client satisfaction: NPS ®
Testimonials
Collated independently by Legal 500 research team.
- 'A multi-partner team that works well together.'
Key clients
- Wayne-Sanderson Farms
- Major League Soccer (MLS)
- Bright Data
- Sandoz
- National Football League (NFL)
- Butterball, LLC
- Lupin Pharmaceuticals
- Copperweld Bimetallics
- Barnabas Health
- Continental Resources
- Asset Management Companies
- California Institute of Technology
- Land O’Lakes
- Egg Clearinghouse, Inc.
- G.II. Industries (dba Waste Management)
- BIG EAST Conference
Practice head
Colin Kass, Christopher Ondeck
Other key lawyers
John Ingrassia; Mark Rosman; Kyle Casazza; Stephen Chuk; Shawn Ledingham; David Munkittrick