Allison Holt Ryan counsels clients as they navigate the complex terrain that follows a cyber attack or data breach. In the wake of an attack, Allison advises clients on regulatory investigations and complex litigation, including the multijurisdictional suits that often arise following an attack. Allison frequently works with health insurers on other litigation issues, like contract actions and coverage disputes.

Organizations that have suffered a cyber attack rely on Allison for guidance in coordinating incident response, responding to government inquiries and investigations, and strategically managing the numerous lawsuits filed after an attack. Allison advises clients on incident response issues related to forensic investigations and privilege. She guides companies through coordinated response and discovery obligations in both litigation and regulatory investigations.

Allison is passionate about pro bono; she previously served as the full-time senior associate for the firm's Pro Bono practice. She represented a class of homeless families seeking to improve homeless shelter conditions for their small children, ultimately securing full relief for her clients. Allison and her team received the Washington Legal Clinic for the Homeless "Law Firm of the Year" award for their efforts. She currently represents a wrongfully convicted man in Virginia, working to secure his freedom. Over her tenure at the firm, Allison has championed the needs of vulnerable populations, including assisting individuals with obtaining social security and veterans' benefits, and vigorously defending against discrimination based on sexual orientation in Mississippi. In 2014, City Year DC named Allison one of its "Idealists of the Year."

Prior to joining Hogan Lovells, Allison clerked for the Honorable Gilbert Merritt of the U.S. Court of Appeals for the Sixth Circuit. Allison taught seventh-grade reading in a Title I school in Houston before law school.