The answer is Michel Musso!
Mitchell Musso does the voice of Jeremy Johnson on Phineas and Ferb.
Mitchell Musso plays jeremy on Phineas and ferb!
Allison Stoner plays Isabella's voice in Phineas and Ferb.
He voiced by Thomas Sangster
Vincent Martella is the voice of Phineas Flynn on Phineas and Feb.
Mitchel Musso plays Jeremy Johnson on Phineas and Ferb
If you mean the voice of Phineas on Phineas and Ferb, then Vincent Martella.
Jeff "Swampy" Marsh is the voice of Major Monagram on Phineas and Ferb.
Phineas Flynn-Vincent Martella Ferb Fletcher (step brother)-Thomas Sangster
Alyson Stoner
Allison stone
Kelly Hu