Michael Faraday was a 19th Chemist and physicist. He worked in the fields of electromagnetism and electrochemistry. Faraday studied the magnetic field around a conductor carrying a DC electric current, and established the basis for the magnetic field concept in physics. John Tyndall was an Irish physicist, whose initial scientific fame came from his study of diamagnetism, which led to his appointment as successor to Michael Faraday at the Royal Institution in 1862.