Psalm 50 and Psalms 73–83 all carry titles naming which man?

Answer: Asaph

Twelve psalms are titled "of Asaph": Psalm 50 and Psalms 73 through 83, e.g. Psalm 73:1, "A Psalm of Asaph."

“A Psalm of Asaph. The Mighty One, God the LORD, speaks and summons the earth from where the sun rises to where it sets. A Psalm of Asaph. Surely God is good to Israel, to those who are pure in heart. A song. A Psalm of Asaph. O God, be not silent; be not speechless; be not still, O God.”— Psalm 50:1, 73:1, 83:1 (BSB)