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Green Cabbage certification classes
Become a Certified Deal Negotiator
Counter supplier strategies, sharpen deal messaging, and run complex deals with control. Earn your certificate and 8 hours of continuing education credit that can be applied toward certifications such as CPSM, ISM, and other procurement credentials. 
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Click “View schedule” to expand quarterly dates for each class.

Class 1
Class 1
Implementing the Deal Leverage Management Process

Build a repeatable leverage model and information strategy before renewal discussions begin.

Class 1 Details

Quarterly schedule

 Monday - Friday, 12:30pm to 2:00pm ET  

Q1
Jan 12 - 16, 2026
Q2
Apr 20 - 24, 2026
Q3
Jul 13 - 17, 2026
Q4
Oct 12 - 16, 2026
Class 2
Class 2
Countering Supplier Strategies and Building Effective Deal Messaging

Neutralize supplier narratives and align stakeholders with messaging that holds under pressure.

Class 2 Details

Quarterly schedule

 Monday - Friday, 12:30pm to 2:00pm ET 

Q1
Feb 16 -  20, 2026
Q2
May 18 - 22, 2026
Q3
Aug 17 - 21, 2026
Q4
Nov 9 - 13, 2026
Class 3
Class 3
Leading Complex Deals

Run complex deals with cadence, decision control, and clean accountability across teams.

 

Class 3 Details

Quarterly schedule

Monday - Friday, 12:30pm to 2:00pm ET

Q1
Mar 16 - 20, 2026
Q2
Jun 15 - 19, 2026
Q3
Sep 14 - 18, 2026
Q4
Dec 7 - 11, 2026
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 Join our monthly Class Preview at No-Cost, a live session led by a subject matter expert designed to give you a clear snapshot of our certification class approach and value.

What you get

Live preview, sample materials, and recommended attendee roles based on your deal profile.

Learn from an expert practitioner

Practical instruction, built from real supplier and buyer-side negotiation experience.

Andrew Ozlowski
Andrew Ozlowski
CSO, Green Cabbage Inc.
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✓ 20+ years in procurement and negotiations
✓ Led enterprise supplier negotiations and risk reviews
✓  Supplier-side industry practitioner 
Andrew graduated from Purdue University in 1992 and built a 20-year career in complex information technology solution sales and consulting with companies including SAP, Computer Associates, Kronos, and Accenture. He combines supplier-side and buyer-side experience to teach teams how to control the negotiation process and drive better outcomes.
“The goal is to communicate leverage clearly enough that the supplier changes their behavior.”