In 1762 he entered into the service of Duke Christian IV of Zweibrücken as a violinist.
He was highly respected by his contemporaries and achieved international recognition as an accomplished composer, bassoonist, and concertmaster during his lifetime.
His 31 symphonies and 20 concertos comprise the main body of his works, but he also composed chamber music including Six Flute Quartets op.
Christian Friedrich Daniel Schubart praised Eichner's works in 1784 for their gracious charm and "melting sweetness".
9 (movements: Allegro, Andante, and Tempo di Minoetto) is performed to this day.