Scull was born in Pittsburgh, Pennsylvania. He attended the common schools in Pittsburgh and preparatory school in Steubenville, Ohio.[1] He studied law and was admitted to the Westmoreland County bar in 1844.[2] He moved to Somerset, Pennsylvania in 1846 and practiced law until 1857. He served as prothonotary and clerk of the court for three years.
He was appointed collector of internal revenue for the Sixteenth district of Pennsylvania by President Abraham Lincoln in 1863.[3] He was removed by President Andrew Johnson in September 1866. He served as a member of the Pennsylvania State Senate for the 20th district in 1871.[1] He served as a delegate to the Republican National Conventions in 1864, 1876, and 1884. He was appointed assessor of internal revenue by President Ulysses S. Grant in April 1869, and again appointed collector, on March 22, 1873, and served until August 1883, when the district was consolidated with another. He published and edited the Somerset Herald from 1852 to 1887 and worked as president of the First National Bank of Somerset until his death.[2]
Scull was elected as a Republican to the Fiftieth, Fifty-first, and Fifty-second Congresses. After his time in Congress, he retired to Somerset. He died in Somerset.