Sidley Austin LLP boasts a capable transaction tax offering based across the US. The team handles capital markets work such as public offerings, fund formations for leading asset management and private equity firms, and M&A. Bridget O’Neill heads the Chicago-based tax group and regularly works with leading funds on formation and structuring, REITs, and partnerships. Robert Kreitman, based in New York is another key name. Scott Pollock is another notable figure handling investment partnerships. John Schaff and Rob Carlson are other key members of the transactional tax team. Co-head Rachel Kleinberg left the firm in January 2026.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
‘Scott Pollock is my go-to. He has a deep and wide-ranging breadth of expertise and is responsive/available. He is measured and deliberate and is not afraid to give off the cuff advice. Ranks far ahead of his peers.’
- 'Overall, the practice combines depth, credibility, and rigor clients expect from a leading firm with flexibility, creativity, and attentiveness of a more bespoke offering.'
- 'John Schaff - Ability to distill complex investment and tax-related topics clearly. Highly personable. Provides supplemental examples and models to illustrate design outcomes. Rob Carlson - Ability to get to the heart of matters quickly and roadmap practical courses of action. Highly experienced and demonstrates both breadth and depth. Highly responsive.'
Key clients
- Accelerant Holdings LP
- Arthur J. Gallagher & Co.
- Aspen Insurance Holdings Limited
- Brightstar Lottery PLC
- Darling Ingredients Inc.
- FlowCo Holdings Inc.
- Fortitude Group Holdings, LLC
- Glenfarne Infrastructure Holdings
- Hennessy Capital Investment Corp. VI
- Ryan Specialty
- Stonepeak Infrastructure Partners
- United Airlines, Inc.
Practice head
Robert Kreitman; Bridget O'Neill
Other key lawyers
Scott Pollock; Peter Edgerton; John Schaff; Rob Carlson