After he graduated from McPherson High School, he earned bachelor degrees in Business Management and Finance from Tabor College in Hillsboro.

[2] He later graduated from Wichita State University's Hugo Wall School of Public Affairs as Certified Master County Clerk.

[3] Arnold worked in the finance industry before his 2008 election to the office of Sedgwick County Clerk.

[5] He is a member of the Executive Committee for South Central Kansas of the County Clerks & Election Officials.

[5] From January 2013 to February 2019, Arnold served as Chairman of the Kansas Republican Party (KSGOP).