
Dr. Jason Arnold is a psychologist at Walden Behavioral Care, a private, inpatient facility specializing in treating eating disorders in Waltham, Massachusetts. His biography on Walden’s blog notes that he “has professional interests in trauma, men’s issues, and cultural issues in clinical practice.”
However, his social media accounts portray a wholly different person. He is a supporter of the Proud Boys, which was designated a hate group by the Southern Poverty Law Center. He is in the process of attempting to join the American Guard, a group founded by Outlaw Hammerskins co-founder and former member of the KKK, Brien James. The Anti-Defamation League refers to the American Guard as “hardcore white supremacists.”

Above: Via his Facebook account, Jason Arnold inquires about joining American Guard to John Camden, New Hampshire American Guard President.

Above: Jason Arnold replies “I need one” to someone displaying a Proud Boys flag
On Facebook, Arnold has been a longtime supporter of the crypto-fascist groups Resist Marxism and Boston Free Speech– both of which have documented ties to the neo-Nazi Patriot Front– as well as Patriot Prayer, which has been involved in multiple instances in which its members have attacked leftist protesters.

Above: After Joey Gibson of Patriot Prayer led members of Resist Marxism and the Proud Boys to attack protesters on October 6, 2018, in Providence, Rhode Island, Joey Gibson livestreamed a monologue. Jason Arnold reacted with a giant smiley face.

Above: Jason Arnold thanks Boston Free Speech for their “hard work.” Boston Free Speech leader John Medlar is a member of the hate group the Proud Boys, and has publicly exposed ties to other fascist organizers.
On his Twitter account– @JasonMatt77— Arnold is more open about his views. He calls for violence against leftist protesters, and frequently bodyshames people he politically disagrees with– strange behavior for a psychologist who specializes in treating eating disorders.
Above: Arnold’s Twitter, where he threatens violence against leftists, and bodyshames those with whom he politically disagrees.

Following the transphobic beliefs of his beloved Proud Boys– whose founder, Gavin McInnes, once implored his viewers to “Choke a tranny. Get your fingers around the windpipe”– Arnold also displays his transphobia, referring to nonbinary genders as “straight up lunacy and social madness.”
He also displays frequent support for the Proud Boys and their founder, Gavin McInnes.
In addition to his transphobia and support for hate groups, Arnold also displays his misogyny and clear disdain for Latinos, referring to Rep. Ocasio-Cortez as “this bitch,” calling undocumented persons “illegals,” and retweeting a Patriot Prayer exhortation to donate to the construction of a southern border wall for the United States. In response to response to Dr. Christine Blasey Ford’s allegations that she had been sexually assaulted by Supreme Court Nominee Brett Kavanaugh, Arnold tweeted, “Have a Beer [sic] with Brett. Drink up everyone!”
Given Arnold’s support for– and attempts to join– multiple hate groups, combined with his clear contempt for trans people, Latinos, and women of all races, combined with the bodyshaming he engages in on Twitter, we do not feel that Dr. Jason Arnold should be serving as a medical professional treating people with eating disorders.
He is currently employed at the Walden Behavioral Clinic. You can call them at 781-647-6700, or contact them via their web page here.

Additionally, Arnold is licensed by the Board of Allied Mental Health and Human Services. If you wish to file a complaint with them, his license number is 8394, and you can email them at amh.board@mass.gov or call them at (617) 727-3080.