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At Aaron G. Christensen, Attorney at Law PLLC, we believe working together and having clear and open lines of communication aid our ability to serve our clients. Our team is made up of a diverse group of talented and compassionate individuals who are focused on helping you on your immigration journey.
Williams Urquilla, MBA
Director of Operations
Williams Urquilla serves as Director of Operations at Aaron G. Christensen, Attorney at Law, PLLC, bringing almost a decade of experience in U.S. immigration law operations, organizational management, and legal team leadership.
His professional expertise encompasses the operational structure of both U.S. Citizenship and Immigration Services (USCIS) and the Executive Office for Immigration Review (EOIR), including immigration case management, legal workflow coordination, organizational development, and operational performance.
Since joining AGC Law Firm in 2024, Williams has played a central role in strengthening the firm’s operational infrastructure, overseeing legal and administrative workflows, implementing performance management systems, and advancing initiatives focused on organizational efficiency, accountability, technology integration, and client experience.
As Director of Operations, he works closely with firm leadership to oversee daily operations, develop high-performing teams, improve internal systems, and support strategic initiatives aligned with the firm’s long-term growth and organizational objectives.
Williams holds a Master of Business Administration (MBA) from the University of Phoenix and a bachelor’s degree in Business Administration. His professional background spans immigration law firms, corporate legal operations, organizational management, and cross-functional leadership.
Committed to continuous professional development, Williams actively studies leadership, business strategy, operational excellence, and organizational improvement. His management philosophy emphasizes building effective systems, empowering professionals, encouraging accountability, and fostering a culture of continuous learning.
Fluent in English and Spanish, Williams is dedicated to strengthening the firm’s operational capabilities while supporting its commitment to exceptional legal services and client experience.
His advice: “Trust that we have your best interests at heart, and we’ll do everything we can to help your immigration case.”
Karen Resendez
Human Resources Manager
Karen Resendez serves as Human Resources Manager at Aaron G. Christensen, Attorney at Law, PLLC, bringing six years of experience in immigration law firm operations, client service, and team coordination.
Karen began her journey at the firm as a receptionist and advanced through office coordination and operational management into her current role. Her experience gives her a practical understanding of how clear communication, organized processes, and a supported team contribute to the client experience.
Throughout her time at the firm, Karen has helped develop clearer scheduling and follow-up procedures and strengthen administrative documentation. She also monitors team performance by reviewing call activity, lead follow-up, consultation scheduling, collection progress, and payment accuracy. Working with leadership, she uses these findings to identify gaps, recommend realistic department goals, guide training, and strengthen accountability.
In her current role, Karen supports recruitment, onboarding, staff training, and employee development. She works closely with management to communicate expectations, address staff concerns, and encourage cooperation across departments.
As the daughter of Mexican immigrants, Karen brings a personal connection to the families the firm serves. She is committed to creating an environment where clients feel heard and employees feel supported.
Her advice: “Lead with kindness, communicate clearly, and follow through. Whether you’re helping a client or supporting a teammate, taking the time to listen can make all the difference.”
Byanka Guido
Receptionist
Byanka discovered her passion for customer service through her love of helping others and creating positive experiences. Her goal is to ensure every client feels supported and valued, and she takes pride in paying close attention to the details that make all the difference.
Outside of work, she enjoys yoga, exploring new places, and spending quality time with her loved ones.
Her advice: “It does not need to be easy, but it needs to be possible.”
Estefany Tercero
Immigration Court Paralegal
Estefany Tercero serves as an Immigration Court Paralegal with seven years of experience in immigration law, including extensive hands-on involvement in immigration court proceedings. She has developed a strong understanding of the complexities of immigration law and the unique challenges individuals and families face while navigating the legal system.
Estefany is deeply passionate about making a meaningful difference in her clients’ lives. From preparing documents for court hearings and supporting removal defense cases to assisting with asylum applications and family petitions, she is committed to providing thorough, compassionate, and dedicated support at every stage of the process. Outside of work, Estefany enjoys exercising and spending quality time with her family, which helps her stay grounded and balanced in a demanding profession.
Lina Montaña
Immigration Court Paralegal
Lina is committed to learning from every immigration case, believing that the law should be practiced with both passion and humanity. She finds joy in helping others while gaining new insights. In her free time, Lina enjoys watching movies, reading, dining out, and researching new laws.
Her advice: “Immigration processes can be long, but always be truthful, gather solid evidence, and be meticulous with your information.”
Raul
Immigration Court Paralegal
Raul brings over 10 years of experience in social services, primarily supporting low-income communities and underrepresented populations. He joined the firm as a Junior Paralegal, where he conducts initial detainee research, processes FOIA requests, and prepares Employment Authorization Document (EAD) applications.
Raul is passionate about educating the immigrant community and ensuring individuals understand their rights and legal options so they can make informed decisions about their future. He finds the greatest fulfillment in serving as a trusted resource for clients during challenging times. Outside the office, Raul enjoys riding his motorcycles and spending time with his pets, helping him maintain a healthy work-life balance.
