He was born on October 19, 1966 in Stockton, California to his parents Richard and Jane Moylan and has four brothers Jeffrey, Scott, Brian and Steven. Moylan is the grandson of the late Scotty Moylan, a former businessman and Patriarch. His cousins are former lieutenant governor is Kaleo Moylan and Kamaka Moylan Alston a realtor. Moylan is an attorney licensed to practice law in California, Guam and Washington D.C. He served as the Legislative Counsel to the 24th, 25th and 26th Guam Legislatures before becoming Guam's first elected Attorney General in January 2003, for a 4-year term. He also served several terms as a Guam Election Commission board member, appointed by Guam's Republican Party to hold 1 of 3 Republican slots.