Senior Arbiter John Gemmill sat on the Arizona Court of Appeals from 2001 to 2016. His colleagues elected him Vice Chief Judge of the Division from 2003 to 2006 and Chief Judge from 2006 to 2008. Prior to this, Senior Arbiter Gemmill spent 25 years in private practice with Teilborg, Sanders & Parks, P.C., where he handled personal injury, wrongful death, product liability, insurance, and commercial litigation and obtained considerable jury trial and appellate experience, plus substantial mediation experience. He has received numerous awards, including the Judicial Excellence Award from the Arizona Association of Defense Counsel in 2014, and was inducted into the Maricopa County Bar Association Hall of Fame in 2015.

Senior Arbiter Gemmill received his B.Sc. (Agr.) and J.D. from the University of Arizona.

Senior Arbiter John Pelander served on the Arizona Supreme Court from 2009 to 2019. Prior to this, Senior Arbiter Pelander was a judge in the Arizona Court of Appeals from 1995 to 2009. Senior Arbiter Pelander also spent 18 years in private practice, from 1977 to 1995, as a partner at Slutes, Browning Sakrison & Grant, P.C., from 1981 to 1984 and as partner at Slutes, Sakrison, Grant & Pelander, P.C., from 1984 to 1995. He has received numerous awards for his illustrious career in law, including the Citation Award, Wittenberg University, 2010; the Professional Achievement Award, University of Arizona James E. Rogers College of Law, 2010; and the Distinguished Alumnus Award, University of Arizona James E. Rogers College of Law, 2007.

Senior Arbiter Pelander received his B.A. from Wittenberg University; his J.D. from the University of Arizona; and his LL.M. from the University of Virginia.

Senior Arbiter Kenneth Mangum sat on the Superior Court of Maricopa County, Arizona, from 1991 to 2011. His broad experience included serving on the four major departments of the Superior Court (i.e., civil, criminal, family, and juvenile). Prior to this, Senior Arbiter Mangum spent 13 years in private practice with Robbins & Green, from 1977 to 1990, and he also served as a Navy JAG officer from 1972 to 1976. Senior Arbiter Mangum then returned to litigation as a Deputy County Attorney in 2011, handling civil litigation and defending the county directly and its employees in trials and by motion practice. During his time on the Superior Court of Maricopa County, Senior Arbiter Mangum was honored by consistently being ranked among the highest in judicial evaluations. Senior Arbiter Mangum is a Spanish-speaker.

Senior Arbiter Mangum received his B.A. from Brigham Young University and his J.D. from the University of Chicago.

Arbiter Mark Higgins has been an Australian barrister at Black Chambers for the last 19 years and practices primarily criminal law, child protection and administrative law. More specifically, his criminal law practice focuses on regulatory prosecutions of corporations by various statutory authorities; his child protection practice focuses primarily on appearing for child welfare agencies; and the administrative law aspect of his practice focuses on disciplinary and sporting tribunals in most states of Australia. Prior to this, Arbiter Higgins spent 11 years in various capacities with the Legal Aid Commission of New South Wales.

Arbiter Higgins received his LL.B. from the University of Sydney and his LL.M. from the University of New South Wales.

Arbiter Martin Klapper is an Australian lawyer and works with a domestic and international client base and advises on significant mining and public infrastructure projects and disputes. With more than 30 years’ experience, Arbiter Klapper has developed a reputation as one of the most effective and sought-after energy and resources lawyers in Australia. He was named as a leading Australian Energy and Resources Lawyer in Chambers Asia-Pacific from 2012 to 2015 and 2017to 2019 and ranked in The International Who’s Who of Oil & Gas Lawyers for many years. Arbiter Klapper received his B.A. from St. Peter's Luther College and his LL.B. from the University of Queensland.

Arbiter Ilya Shapiro is a leading U.S. and international expert on constitutional law and governance structures and the head of the Cato Institute’s Robert A. Levy Centre on Constitutional Studies. Prior to this, his myriad roles have included Special Assistant/Advisor on Rule of Law Issues to the Multi-National Force-Iraq in 2007, Adjunct Professor of Legal Research and Writing at George Washington University Law School from 2005 to 2007 and Policy Staff with Bush-Cheney ‘04. He has also held positions at prestigious law firms, including Patton Boggs LLP and Cleary, Gottlieb, Steen & Hamilton LLP, and was a law clerk on the U.S. Court of Appeals for the Fifth Circuit from 2003 to 2004. Arbiter Shapiro is a Spanish-speaker. Arbiter Shapiro received his A.B. from Princeton University; his M.Sc. from the London School of Economics; and his J.D. from the University of Chicago.

Mr. Humberto N. Macias serves as an arbiter for the PAC. Prior to this, he served as Deputy General Counsel of Honduras Próspera Inc.. He has assisted with founding and/or acquiring companies focused on soft infrastructure, including in education and private security, and he has also held positions as a transactional attorney at prestigious law firms, including Clifford Chance in Singapore and Skadden, Arps, Slate, Meagher & Flom LLP in Los Angeles, California. Mr. Macias holds a J.D. from Harvard Law School as well as a B.A. in Economics and an M.A. in Sociology from Stanford University. Mr. Macias is a Spanish-speaker and originally from Los Angeles, California.

Arbiter Susanna Dokupil currently consults on political, public relations, fundraising, and business strategy as Chief Executive Officer of Paladin Strategies. Prior to this, her myriad roles have included Special Counsel to the United States Senate Judiciary Committee in 2010, Assistant Solicitor General in the Office of the Texas Attorney General from 2006 to 2009 and Assistant Attorney General in the Office of the Texas Attorney General from 2004 to 2006. She was also a Texas State Representative candidate from 2016 to 2017 and a law clerk on the U.S. Court of Appeals for the Fifth Circuit from 2000 to 2001.

Arbiter Dokupil received her B.A. and M.A. from Baylor University; her J.D. from Harvard Law School; and her M.P.S. from George Washington University.

Arbiter Pablo Palma is a Chilean-German lawyer and has been, among other things, a partner with Palma & Palma Abogados in Germany for the last 10 years and practices primarily real estate law, inheritance law/family law, commercial law and electronic commerce. Arbiter Palma has the distinction of being the first Chilean lawyer to obtain permission from the Berlin Bar Association to act as a legal advisor in Chilean law in Germany. Arbiter Palma is a Spanish-speaker.

Arbiter Palma received his B.A. from the Universidad del Mar (Chile); his LL.M. from Humboldt University of Berlin; and his Ph.D. from the Free University of Berlin.

Ricardo A. González is a Honduran lawyer cofounder of the first Honduran law firm catered to serve the highest standards of corporate counseling to the entrepreneurship community in the country. Serving from time to time as legal mentor for incubators and acceleration programs such as Startup SPS, Honduras Digital Challenge, Founder Institute and The Technological University of Central America ́s Entrepreneurship HUB. Active member of the Honduran Young Arbitrators Association for over 5 years where he has served as Director of the San Pedro Sula’s Chapter.

Ricardo received his B.A. from The University of San Pedro Sula (Honduras); and his LL.M. in Corporate Law and Practice from The Pennsylvania State University.