
Data Privacy
Cybersecurity
Artificial Intelligence
Commercial Litigation
Government Investigations
Ernesto R. Claeyssen is a Managing Associate at Sidley Austin in New York City. He specializes in transactional, regulatory, and litigation matters related to data privacy, cybersecurity, and artificial intelligence, as well as commercial litigation and government investigations. Ernesto is adept at guiding clients through complex U.S. federal and state privacy laws, developing compliance programs, and handling corporate transactions. He holds a JD from Rutgers School of Law - Newark and a BA from Rutgers University - Newark. Ernesto's experience includes working with high-profile clients in mergers and acquisitions and advising on privacy and cybersecurity diligence.
Ernesto Claeyssen's representative experience includes advising:


- General Atlantic acted as the acquirer in this Private Equity transaction. - The acquisition was executed in the Consumer / Skincare sector, strengthening the buyer’s strategic position. - The transaction was announced on 2025-09-16 00:00:00 with a reported value of 1500000000.
Sep 16 2025
2B
Private Equity

Managing Associate
2024 – Unknown
Associate
2021 – 2024
Summer Associate
2019 – 2019
Legal Analysis, Writing, and Research Skills Teaching Assistant
2019 – 2020

- TowerBrook Capital Partners, L.P. and Prelude Growth Partners acquired the target/assets from Amylu Foods in a Private Equity transaction on not available. - Deal value was 4400000000 Sector: Food; Location: USA. - On the acquirer side, counsel was not available; lawyers included Brien Wassner, Nick Phillips, Curt Ostosh, Joshua J. Rim, Sarah Wiley, Amy Jang, Christine Seo, Christian Brause, Dustin R. Anderson, Patrick M. Gray, Eric S. Wolf, Amanda M. Casanueva, P.C. Wang, Rebecca Stuart, Allison C. Ivey Toth, Vadim Brusser, Miriam Carroll Silvestri, Diane C. McEnroe, Kevin A. Sforza, Maureen M. Crough, Sarah A. Jehl, Ernesto R. Claeyssen, Arifa Ali, Daniel F. Burkhart, Scott J.F. Goldstein, Ash Nagdev.
Aug 07 2025
4B
Private Equity
Dec 9

2 min
Research Assistant
2019 – 2019
CLASP Fellow
2018 – 2020
Judicial Intern
2019 – 2019
Summer Law Clerk
2018 – 2018
Honors Intern
2016 – 2018
Constituent Intern
2016 – 2016
Civil Liberties Intern
2015 – 2015