Meet Our Staff

Valeria Marinero

Legal Assistant

Valeria Marinero began working for DeCosmo & Rolón in October of 2018. She obtained her bachelor’s degree in Criminal Justice from Rutgers University and is looking forward to attending law school. While attending school full time, she has been employed in the legal field gaining experience. Her involvement has helped her develop skills to further her career as an immigration attorney. Valeria spends her time volunteering with the Hispanic community through her church. As a first-generation daughter of Salvadoran parents, she has firsthand experience in helping families with their immigration process. She is active in supporting immigrant rights by participating in marches throughout the tri-state area. Valeria is fluent in Spanish.

Sergio Sandoval

Legal Assistant

Sergio Sandoval has worked with Derek DeCosmo since 2015. He obtained his Associate’s Degree in Paralegal Studies in 2017. As an immigrant himself Sergio understands the challenges faced by new immigrants in the United States. He is passionate about assisting the immigrant community in all of their immigration and criminal matters. Sergio is fluent in Spanish.

Leonela Villacis


Leonela Villacis began working for DeCosmo & Rolón in April of 2019. She gained vast knowledge within immigration law from her prior work experience in Long Island, New York. With her relocation to New Jersey, Leonela brings her expertise in immigration matters such as DACA, asylum, cancellation of removal, and family petitions. Her passion for justice transcends the workplace through volunteering for her community and using her digital platforms to be vocal on injustices against underrepresented minorities. Leonela is fluent in Spanish.