Atty. Arnold is the Managing Partner of AAA AND CO., CPAS. He was a tax lawyer of Quasha Ancheta Pena and Nolasco Law Office, where he handled tax cases and corporate advisory for 4 years. His employment with the Bureau of Internal Revenue (BIR) as Revenue Officer from 2004 to 2011 allowed him to gain extensive knowledge in taxation beneficial to both individuals and corporate entities. He received several commendations from the BIR Mandaluyong, including consistent top revenue collector from 2009 to 2011.
He was also a professor at the University of Asia and the Pacific, University of the East and Pamantasan ng Lungsod ng Maynila. He is a graduate of the University of the East where he earned his Bachelor of Laws and Bachelor of Science in Accountancy.