P. F. "Flip" Sloan (born Philip Gary Schlein; September 18, 1945 – November 15, 2015) was an American pop-rock singer and songwriter. He was very successful during the mid-1960s, writing, performing, and producing "Billboard" Top 20 hits for artists such as Barry McGuire, The Searchers, Jan and Dean, Herman's Hermits, Johnny Rivers, The Grass Roots, The Turtles and The Mamas and the Papas. Sloan's signature song is "Eve of Destruction" – a 1965 US number one (and UK no. 3) for Barry McGuire. Many of his songs were written in collaboration with Steve Barri. Their partnership yielded two US Top Ten hits — Herman's Hermits' "A Must to Avoid" (1965/66) and Johnny Rivers's "Secret Agent Man" (1966) — and the Turtles' "You Baby" (1966 US no. 20).