Jordan Mark Witzigreuter (born November 14, 1989), known professionally as Onlychild and formerly as The Ready Set, is an American singer-songwriter from Fort Wayne, Indiana, United States. He is the lead vocalist and sole member of the act, using a backup band while on tour. He has released five studio albums, Syntax and Bright Lights, Tantrum Castle, I'm Alive, I'm Dreaming, The Bad & the Better, and I Will Be Nothing Without Your Love, six extended plays and seven singles. He is best known for the commercially successful single "Love Like Woe" from his major label debut I'm Alive, I'm Dreaming.
As of July 2019, Witzigreuter has begun a new project, now using the name "Onlychild." He has released six singles and a four-track EP Solstice under this name.
Witzigreuter is also a part of the synthpop band Nekokat, alongside Cameron Walker, and Jess Bowen of The Summer Set.