Mr. Dixler concentrates his practice to immigration, visa law, citizenship since 1993. He remains a member of the American Immigration Lawyers Association's Chicago and Rome Chapters. Many clients are family immigration clients, because he encourages family visas over employment-based visas, where possible. Others are foreigners or permanent residents with DUI, criminal arrests or convictions. Criminal attorneys contact him about the immigration consequences of a criminal record to their foreign clients. He has significant experience with waivers of inadmissibility for crime, fraud and unlawful presence and lectures on this topic. Mr. Dixler successfully defends clients in the Immigration Courts, Board of Immigration Appeals and Federal Courts. He has filed successful lawsuits against the U. S. Citizenship and Immigration Service in Federal Court to challenge unreasonable delays with adjudication, naturalizations and name checks. He is functionally bilingual in Spanish and is a Chicago Native also originally from Central Rogers Park

Vivian R. Khalaf is a founding partner of Khalaf & Abuzir, LLC, and its affiliate office in Ramallah, Palestine, “Agility Services”. Ms. Khalaf has over 20 years of immigration law experience and practices both family and business immigration. She is also well-versed in family law, with an emphasis on Islamic matrimonial issues. Born in Jerusalem, Vivian R. Khalaf obtained her B.A. degree from the University of Illinois at Chicago in 1987 and her J.D. from Illinois Institute of Technology, Chicago-Kent College of Law in 1991. Ms. Khalaf is fluent in the Arabic language and represents a multitude of individuals and corporate clients from various regions in the Middle East. She has resided in both Palestine and Jordan and travels to the region on a regular basis. Ms. Khalaf is a member of the Illinois bar and the United States District Court–Northern District of Illinois.

William Newell Siebert, P.C. was founded in 1969 by William Siebert. Since its inception, the firm has been dedicated to representing the interests of temporary visitors and prospective immigrants alike. William Newell Siebert has been practicing immigration law exclusively since 1969. he has dedicated his career to the representation of non-immigrants and immigrants to the United States. William Siebert has lectured and published widely about the ever-evolving filed of immigration law. William Siebert is a member of the American Immigration Lawyer's Association, the Illinois State Bar Association (Chicago & Miami Chapters), the Chicago Bar Association, and is also admitted to the state bar of Florida.