Marissa R. Sims

Corporate Law

3.0 (1 reviews)

Chicago, Illinois

9+ years experience

Winston & Strawn LLP

Updated: Jan 04, 2026

Contact Information

312-558-5600

https://www.winston.com/en/who-we-are/professionals/sims-marissa-r.html

300 N. LaSalle Drive, Chicago, IL 60654-3406

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Bio

Marissa R. Sims is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law, Employee Benefits (ERISA) Law, Labor and Employment Law - Employee and Labor and Employment Law - Management.Marissa R., who practices law in Chicago, Illinois, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Marissa R. is held by other top lawyers in the same geographic and legal practice area. Marissa R. Sims is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law, Employee Benefits (ERISA) Law, Labor and Employment Law - Employee and Labor and Employment Law - Management.Marissa R., who practices law in Chicago, Illinois, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Marissa R. is held by other top lawyers in the same geographic and legal practice area. Marissa R. is held by other top lawyers in the same geographic and legal practice area.

Practice Areas

Corporate Law

Awards & Recognition

Recognized: Corporate Law
Recognized: Employee Benefits (ERISA) Law
Recognized: Labor and Employment Law - Employee
Recognized: Labor and Employment Law - Management

Recognized in Ones to Watch since 2022

Education

Washington University in St. Louis, J.D., graduated 2016

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Reviews

Ryan Roberts

2 weeks ago

Competent on ERISA matter, but communication could improve

I engaged Marissa Sims at Winston & Strawn to assist with a complex employee benefits issue related to a company merger. Her background in ERISA law and her recognition in that field were the primary reasons for my selection. On the substantive legal work, she was undeniably proficient. She navigated the intricate compliance requirements stemming from the merger of our two benefit plans with clear expertise, and the final documents were meticulously prepared. However, the experience fell short of exceptional in a few operational areas. Response times were sometimes longer than anticipated, requiring follow-up emails to get status updates on draft reviews. While her advice was sound when received, there were moments where I felt a more proactive communication style regarding potential roadblocks would have been beneficial. For a straightforward matter, her competence is evident, and her nine years of experience at a top firm like Winston & Strawn show. Yet, for clients who prioritize consistent, anticipatory communication as part of the service, there is room for refinement. She successfully resolved our issue, but the process felt more transactional than collaborative at times.