Hello, a friend and I were having a discussion on reductions and oxidation of compounds and came upon the question of what would be the outcome of the reduction and oxidation of β-Phenyl-γ-aminobutyric acid respectively. Neither of us have extensive knowledge of organic chemistry, only a basic understanding. After searching forums and articles and not finding an answer, I decided to seek out an experts opinion. Any insight or speculation would be helpful, thanks.

Well you will not get a γ-butyrolactone if that's what you are looking for.

Reduction of the carboxylic acid will give the alcohol if you use the correct reducing agent. Oxidation won't do much either, except give the amine-N-oxide, again it depends on the oxidation reagent.