Our 26th Lucas County Prosecutor was born in Kenton, Ohio in 1875, the son, grandson and great-grandson of lawyers and judges. His father was a judge for the third Ohio Judicial Circuit. His grandfather was a lawyer from Tiffin, Ohio. His great-grandfather had been Chief Justice of the Maryland county court as well as a U.S. Congressman.

Seney was educated in the Kenton public schools and at Oberlin and Ohio Wesleyan preparatory schools before attending Cornell University and the University of Michigan, from which he graduated with a bachelor of Pharmacy degree in 1896. He graduated from The Ohio State University College of Law with an LLB in 1899, the same year that he was admitted to the Ohio Bar.

He first practiced law in North Baltimore, Wood County, Ohio until 1904 when he went into practice in Toledo. He served as first Assistant Prosecuting Attorney for Lucas County from 1915-1919. He was elected Lucas County Prosecutor in the election 1918 and served one term, from 1919-1920, after which he resumed the private practice of law.