Peter, and the most disputed attribution in the New Testament; the early church argued about it too.
When
About AD 65 on the traditional view, or well into the second century.
What it is
A warning against teachers who had made freedom into an excuse, and against giving up because the end had not come.
What to watch for
Its second chapter overlaps heavily with Jude; one of them is using the other.
The Lord is not slow in keeping His promise as some understand slowness, but is patient with you, not wanting anyone to perish but everyone to come to repentance.2 Peter 3:9
Bible Strands