Catherine Toner is an associate with Mayer Brown’s Global Mobility and Migration practice, within the Employment & Benefits group. She specializes in employment-based immigration law and compliance for domestic and international businesses.

As an advocate for her clients and foreign national workers, she approaches complex challenges with a solutions-oriented and holistic approach, considering the professional, personal, and business needs at stake. Catherine advises clients on the full range of non-immigrant visas, including H-1B, L-1, TN, and O-1, as well as permanent residency for professional and skilled workers, multinational managers, and persons of extraordinary ability.

She strives to give employers the confidence and support they need to attract and retain global talent. With a desire to educate and empower, she hosts trainings and presentations for clients on topics such as testing the labor market under Department of Labor regulations, managing an enterprise-wide immigration program, and responding to political events that impact the immigration landscape.

Catherine’s entry into this field is deeply personal, having decided to pursue a career in employment-based immigration during her time working alongside foreign nationals in the thoroughbred racing industry. She continues to merge her passion for horses and legal advocacy and has successfully represented employers filing H-2B petitions for grooms, overcame pandemic-related travel bans to secure a B-1 visa and facilitate international travel for a racehorse trainer, and consults on O-1 and P-1 visas for equestrians competing on the international stage. She has also been published in The Bloodhorse, penning an article on immigration options in the equestrian community.

Spoken Languages

  • Spanish


Gettysburg College, BA

Brooklyn Law School, JD


  • New York
  • Not admitted in the District of Columbia. Practicing under the supervision of firm principals.