Michael Tucker (born August 15, 1990), known professionally as BloodPop (stylized as BloodPop®), is an American musician, record producer, and songwriter. He has previously used the monikers Blood Diamonds, Blood, and Michael Diamond. He is known for writing and producing songs for Lady Gaga, Lily Allen, Britney Spears, Justin Bieber, Madonna, and John Legend. In 2017, he released a collaboration with Bieber, "Friends", as his debut single under the BloodPop moniker.

Source: Wikipedia (https://en.wikipedia.org/wiki/BloodPop)