Grace Signorelli-Cassady handles clients’ most complex, high-stakes legal issues.  She advocates vigorously on their behalf, crafts compelling briefs at pivotal litigation junctures, guides clients through highly-sensitive criminal and investigative matters, and executes strategic solutions. Whatever the case, her approach is both keenly tactical and commonsense.

As a member of the firm’s Native American Law Practice, Grace leans on her experience in high-stakes litigation, sensitive investigations, and as a former federal law clerk to deliver significant victories for tribal clients. She secured an over $100 million trial victory on behalf of a federally recognized Indian tribe in an oil lease dispute, successfully defended that win throughout a legal challenge, and then added another $10 million victory in a related dispute. Beyond litigation, Grace has broad knowledge of tribally owned and operated utilities and has worked on a variety of tribal energy matters, including guiding a tribe’s pursuit of energy sovereignty and independence. Overall, Grace’s work spans matters involving sovereign immunity, minerals disputes, lease disputes, rights-of-way negotiations, trespass claims, gaming, environmental and natural resources issues, and treaty rights. She also assists non-Native clients, ensuring their interests are protected without alienating their tribal partners.

Grace graduated from Harvard Law School and served as a federal law clerk to the Honorable Roslyn O. Silver of the US District Court for the District of Arizona, during which time she also assisted matters taken by designation in the US Courts of Appeals for the Ninth Circuit. At Harvard Law School, she was the managing editor of the Harvard Journal on Legislation, a criminal justice fellow, a law clerk in the Boston United States Attorney’s Office’s Public Corruption and Special Prosecutions Unit, a teaching assistant with the Harvard Negotiation Institute, and a law clerk in the Illinois Attorney General’s Office’s Consumer Protection Division.  Grace also spent three years working for the Miami-Dade State Attorney’s Office prior to law school.

Affiliated with the Chicago office but working remotely.

Credentials

  • Illinois, 2016
  • Arizona, 2024

  • Harvard Law School, JD, 2016
  • Florida State University, BA, magna cum laude, Phi Beta Kappa, 2010

  • US Supreme Court, 2020
  • US District Court, Northern District of Illinois, 2017

  • Hon. Roslyn O. Silver, US District Court, District of Arizona, 2017-2018

Service / Recognition

Publications

Grace Signorelli-Cassady handles clients’ most complex, high-stakes legal issues.  She advocates vigorously on their behalf, crafts compelling briefs at pivotal litigation junctures, guides clients through highly-sensitive criminal and investigative matters, and executes strategic solutions. Whatever the case, her approach is both keenly tactical and commonsense.

As a member of the firm’s Native American Law Practice, Grace leans on her experience in high-stakes litigation, sensitive investigations, and as a former federal law clerk to deliver significant victories for tribal clients. She secured an over $100 million trial victory on behalf of a federally recognized Indian tribe in an oil lease dispute, successfully defended that win throughout a legal challenge, and then added another $10 million victory in a related dispute. Beyond litigation, Grace has broad knowledge of tribally owned and operated utilities and has worked on a variety of tribal energy matters, including guiding a tribe’s pursuit of energy sovereignty and independence. Overall, Grace’s work spans matters involving sovereign immunity, minerals disputes, lease disputes, rights-of-way negotiations, trespass claims, gaming, environmental and natural resources issues, and treaty rights. She also assists non-Native clients, ensuring their interests are protected without alienating their tribal partners.

Grace graduated from Harvard Law School and served as a federal law clerk to the Honorable Roslyn O. Silver of the US District Court for the District of Arizona, during which time she also assisted matters taken by designation in the US Courts of Appeals for the Ninth Circuit. At Harvard Law School, she was the managing editor of the Harvard Journal on Legislation, a criminal justice fellow, a law clerk in the Boston United States Attorney’s Office’s Public Corruption and Special Prosecutions Unit, a teaching assistant with the Harvard Negotiation Institute, and a law clerk in the Illinois Attorney General’s Office’s Consumer Protection Division.  Grace also spent three years working for the Miami-Dade State Attorney’s Office prior to law school.

Affiliated with the Chicago office but working remotely.

  • Illinois, 2016
  • Arizona, 2024

  • Harvard Law School, JD, 2016
  • Florida State University, BA, magna cum laude, Phi Beta Kappa, 2010

  • US Supreme Court, 2020
  • US District Court, Northern District of Illinois, 2017

  • Hon. Roslyn O. Silver, US District Court, District of Arizona, 2017-2018

Publications

Overview

Grace Signorelli-Cassady handles clients’ most complex, high-stakes legal issues.  She advocates vigorously on their behalf, crafts compelling briefs at pivotal litigation junctures, guides clients through highly-sensitive criminal and investigative matters, and executes strategic solutions. Whatever the case, her approach is both keenly tactical and commonsense.

As a member of the firm’s Native American Law Practice, Grace leans on her experience in high-stakes litigation, sensitive investigations, and as a former federal law clerk to deliver significant victories for tribal clients. She secured an over $100 million trial victory on behalf of a federally recognized Indian tribe in an oil lease dispute, successfully defended that win throughout a legal challenge, and then added another $10 million victory in a related dispute. Beyond litigation, Grace has broad knowledge of tribally owned and operated utilities and has worked on a variety of tribal energy matters, including guiding a tribe’s pursuit of energy sovereignty and independence. Overall, Grace’s work spans matters involving sovereign immunity, minerals disputes, lease disputes, rights-of-way negotiations, trespass claims, gaming, environmental and natural resources issues, and treaty rights. She also assists non-Native clients, ensuring their interests are protected without alienating their tribal partners.

Grace graduated from Harvard Law School and served as a federal law clerk to the Honorable Roslyn O. Silver of the US District Court for the District of Arizona, during which time she also assisted matters taken by designation in the US Courts of Appeals for the Ninth Circuit. At Harvard Law School, she was the managing editor of the Harvard Journal on Legislation, a criminal justice fellow, a law clerk in the Boston United States Attorney’s Office’s Public Corruption and Special Prosecutions Unit, a teaching assistant with the Harvard Negotiation Institute, and a law clerk in the Illinois Attorney General’s Office’s Consumer Protection Division.  Grace also spent three years working for the Miami-Dade State Attorney’s Office prior to law school.

Affiliated with the Chicago office but working remotely.

Credentials

Admissions

  • Illinois, 2016
  • Arizona, 2024

Education

  • Harvard Law School, JD, 2016
  • Florida State University, BA, magna cum laude, Phi Beta Kappa, 2010

Court Admissions

  • US Supreme Court, 2020
  • US District Court, Northern District of Illinois, 2017

Clerkships

  • Hon. Roslyn O. Silver, US District Court, District of Arizona, 2017-2018

Service / Recognition

Thought Leadership

Publications

Grace Signorelli-Cassady handles clients’ most complex, high-stakes legal issues.  She advocates vigorously on their behalf, crafts compelling briefs at pivotal litigation junctures, guides clients through highly-sensitive criminal and investigative matters, and executes strategic solutions. Whatever the case, her approach is both keenly tactical and commonsense.

As a member of the firm’s Native American Law Practice, Grace leans on her experience in high-stakes litigation, sensitive investigations, and as a former federal law clerk to deliver significant victories for tribal clients. She secured an over $100 million trial victory on behalf of a federally recognized Indian tribe in an oil lease dispute, successfully defended that win throughout a legal challenge, and then added another $10 million victory in a related dispute. Beyond litigation, Grace has broad knowledge of tribally owned and operated utilities and has worked on a variety of tribal energy matters, including guiding a tribe’s pursuit of energy sovereignty and independence. Overall, Grace’s work spans matters involving sovereign immunity, minerals disputes, lease disputes, rights-of-way negotiations, trespass claims, gaming, environmental and natural resources issues, and treaty rights. She also assists non-Native clients, ensuring their interests are protected without alienating their tribal partners.

Grace graduated from Harvard Law School and served as a federal law clerk to the Honorable Roslyn O. Silver of the US District Court for the District of Arizona, during which time she also assisted matters taken by designation in the US Courts of Appeals for the Ninth Circuit. At Harvard Law School, she was the managing editor of the Harvard Journal on Legislation, a criminal justice fellow, a law clerk in the Boston United States Attorney’s Office’s Public Corruption and Special Prosecutions Unit, a teaching assistant with the Harvard Negotiation Institute, and a law clerk in the Illinois Attorney General’s Office’s Consumer Protection Division.  Grace also spent three years working for the Miami-Dade State Attorney’s Office prior to law school.

Affiliated with the Chicago office but working remotely.

Credentials

  • Illinois, 2016
  • Arizona, 2024

  • Harvard Law School, JD, 2016
  • Florida State University, BA, magna cum laude, Phi Beta Kappa, 2010

  • US Supreme Court, 2020
  • US District Court, Northern District of Illinois, 2017

  • Hon. Roslyn O. Silver, US District Court, District of Arizona, 2017-2018

Service / Recognition

Publications

Grace Signorelli-Cassady handles clients’ most complex, high-stakes legal issues.  She advocates vigorously on their behalf, crafts compelling briefs at pivotal litigation junctures, guides clients through highly-sensitive criminal and investigative matters, and executes strategic solutions. Whatever the case, her approach is both keenly tactical and commonsense.

As a member of the firm’s Native American Law Practice, Grace leans on her experience in high-stakes litigation, sensitive investigations, and as a former federal law clerk to deliver significant victories for tribal clients. She secured an over $100 million trial victory on behalf of a federally recognized Indian tribe in an oil lease dispute, successfully defended that win throughout a legal challenge, and then added another $10 million victory in a related dispute. Beyond litigation, Grace has broad knowledge of tribally owned and operated utilities and has worked on a variety of tribal energy matters, including guiding a tribe’s pursuit of energy sovereignty and independence. Overall, Grace’s work spans matters involving sovereign immunity, minerals disputes, lease disputes, rights-of-way negotiations, trespass claims, gaming, environmental and natural resources issues, and treaty rights. She also assists non-Native clients, ensuring their interests are protected without alienating their tribal partners.

Grace graduated from Harvard Law School and served as a federal law clerk to the Honorable Roslyn O. Silver of the US District Court for the District of Arizona, during which time she also assisted matters taken by designation in the US Courts of Appeals for the Ninth Circuit. At Harvard Law School, she was the managing editor of the Harvard Journal on Legislation, a criminal justice fellow, a law clerk in the Boston United States Attorney’s Office’s Public Corruption and Special Prosecutions Unit, a teaching assistant with the Harvard Negotiation Institute, and a law clerk in the Illinois Attorney General’s Office’s Consumer Protection Division.  Grace also spent three years working for the Miami-Dade State Attorney’s Office prior to law school.

Affiliated with the Chicago office but working remotely.

  • Illinois, 2016
  • Arizona, 2024

  • Harvard Law School, JD, 2016
  • Florida State University, BA, magna cum laude, Phi Beta Kappa, 2010

  • US Supreme Court, 2020
  • US District Court, Northern District of Illinois, 2017

  • Hon. Roslyn O. Silver, US District Court, District of Arizona, 2017-2018

Publications

Overview

Grace Signorelli-Cassady handles clients’ most complex, high-stakes legal issues.  She advocates vigorously on their behalf, crafts compelling briefs at pivotal litigation junctures, guides clients through highly-sensitive criminal and investigative matters, and executes strategic solutions. Whatever the case, her approach is both keenly tactical and commonsense.

As a member of the firm’s Native American Law Practice, Grace leans on her experience in high-stakes litigation, sensitive investigations, and as a former federal law clerk to deliver significant victories for tribal clients. She secured an over $100 million trial victory on behalf of a federally recognized Indian tribe in an oil lease dispute, successfully defended that win throughout a legal challenge, and then added another $10 million victory in a related dispute. Beyond litigation, Grace has broad knowledge of tribally owned and operated utilities and has worked on a variety of tribal energy matters, including guiding a tribe’s pursuit of energy sovereignty and independence. Overall, Grace’s work spans matters involving sovereign immunity, minerals disputes, lease disputes, rights-of-way negotiations, trespass claims, gaming, environmental and natural resources issues, and treaty rights. She also assists non-Native clients, ensuring their interests are protected without alienating their tribal partners.

Grace graduated from Harvard Law School and served as a federal law clerk to the Honorable Roslyn O. Silver of the US District Court for the District of Arizona, during which time she also assisted matters taken by designation in the US Courts of Appeals for the Ninth Circuit. At Harvard Law School, she was the managing editor of the Harvard Journal on Legislation, a criminal justice fellow, a law clerk in the Boston United States Attorney’s Office’s Public Corruption and Special Prosecutions Unit, a teaching assistant with the Harvard Negotiation Institute, and a law clerk in the Illinois Attorney General’s Office’s Consumer Protection Division.  Grace also spent three years working for the Miami-Dade State Attorney’s Office prior to law school.

Affiliated with the Chicago office but working remotely.

Credentials

Admissions

  • Illinois, 2016
  • Arizona, 2024

Education

  • Harvard Law School, JD, 2016
  • Florida State University, BA, magna cum laude, Phi Beta Kappa, 2010

Court Admissions

  • US Supreme Court, 2020
  • US District Court, Northern District of Illinois, 2017

Clerkships

  • Hon. Roslyn O. Silver, US District Court, District of Arizona, 2017-2018

Service / Recognition

Thought Leadership

Publications

News and Insights

Publications

Before You Sign: Key Contract Provisions for Tribes Considering Data Center Developments, ICT

Grace Signorelli-Cassady of Jenner & Block’s Native American Law Practice authored an opinion piece for ICT examining key contract provisions tribes should consider when approached about data center developments.

November 5, 2026

Event

Grace Signorelli-Cassady Returns to Wiring the Rez to Discuss AI in Indian Country

Associate Grace Signorelli-Cassady returned to speak at Wiring the Rez: Innovation Across Indian Country, organized by the Sandra Day O'Connor College of Law at Arizona State University.  The event focused on bringing digital connectivity to tribal lands, and Grace’s session discussed AI and economic growth in Indian Country.

February 18, 2026