Tom Perry

Tom Perry also know as Mr. Perry is the father of Neil Perry and husband of Mrs. Perry. He is the film’s secondary antagonist indirectly causing the death of his son Neil Perry and the firing of John Keating.

Biography
From the beginning of the film, Mr. Perry tries to control Neil’s actions, outlining for him what he can and cannot do during his time in Welton. Mr. Perry forces him to drop from the Annual, which Neil was excited to be the assistant editor for.

He is absent for a large portion of the movie, only returning when he learns of Neil’s defiance through Mr. John Keating's unconventional teaching methods. He yells at Neil in his room and quickly overturned Keating's influence, whilst threatening him that he must resign from A Midsummer’s Dream. Neil refuses, doing it behind his father’s back anyway. His father learns this after going to see the show, and publicly humiliates Neil in front of his friends and Mr. Keating.

Mr. Perry later tells Neil he is sending him to military school, then Harvard, and then medical school to become a doctor. Neil tries to protest, but finds himself unable to. His father shuts him down before going to bed for the night, unaware Neil would commit suicide shortly after this altercation.

After Neil took his own life, Mr. Perry request an investigation to find out who is ring leader the secret group. Mr. Perry (alongside Richard Cameron) assisted headmaster Gale Nolan forced Todd Anderson and the other boys to confess that Mr. Keating was responsible for both his son's death and encouraged his students to restarting the Dead Poets Society and inciting them engage in undisputed behavior.

Personality
Mr. Perry is very strict and controlling. He does likes having control over situations, and hates being rebelled against. He claims to be controlling because he has Neil’s best interests at heart.

He frequently discourages Neil from following his ambitions. He forces Neil to leave the yearbook to focus more on his studies. He also yells at Neil when he performs in the play. This makes him come off as threatening when he tells Neil he will force him to go to a different school.

The reason why Mr. Perry acts this way is because he is giving Neil opportunities he did not get to have as a young man, and believes that Neil will waste them if not properly directed. He does not realize the stress and anxiety this is causing his son, and sees it as only tough love. Mr. Perry does care about Neil, which is evident through how violently he reacts to Neil’s death. If he did not care for Neil, he would not have gone through all the effort to eliminate all responsible parties.

Neil Perry
Neil is Mr. Perry’s son. They do not have a great relationship with Mr. Perry’s oppressive personality constantly hindering Neil from what he wants to do. He does not express much pride in his son, seeming to use him as tool to vicariously live through. Mr. Perry feels he can decide Neil’s entire future which further strains their relationship.

When Neil commits suicide, Mr. Perry still does not reconsider his actions. He shows that he does care about Neil, wanting immediate answers as to why he died. However, he refuses to think that his own actions have consequences instead he (alongside Richard Cameron) believing that it was Mr. John Keating's unorthodox teachings encouraged Neil to pursue a carter in acting career and assists Headmaster Gale Nolan succeed get Todd Anderson and other boys to sign to confess what Mr. Keating taught them to engaged in undisputed behavior.

Mrs. Perry
Mr. Perry also seems to have a strained relationship with his wife. It appears that she has also fallen to Mr. Perry’s oppression. She wants to defend Neil against his father, but just can’t find the strength to do so.

John Keating
Mr. Perry falsely accused John Keating for the death of his son. He told headmaster Gale Nolan that John Keating influencing his son Neil Perry to defying his orders with his free-thinking lessons and naming Todd Anderson, Knox Overstreet, Steven Meeks and Gerard Pitts to Nolan's office where he, headmaster Nolan and each of the boy's parents inpatiently waiting for them to be interrogates about the DPS and signed the confession to get Mr. John Keating fired.

Trivia

 * Mr. Perry finding Neil’s body was most likely emphasized with slow motion for impact. The fact the slow motion is on Mr. Perry might also allude to how much he cares about Neil, because the world figuratively and literally slowed down for that moment.