american record producer and songwriter jack antonoff has released two studio albums and one soundtrack under the solo project bleachers. he has also released 10 studio albums, collectively, among his bands: fun., steel train, and outline. furthermore, he has also served as the co-writer or co-producer on albums by taylor swift, lorde, kevin abstract, lana del rey, and st. vincent; and has written and produced standalone tracks for artists including pink, sara bareilles, fifth harmony, troye sivan, and sia, among many others.