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BRANDON MARSHALL places a foot on the broken concrete ledge of the old schoolyard and hoists himself up. Two drained Miller Lite cans crunch underfoot. He tucks his thumbs under the straps of his orange backpack and peers up at the Larimer School, a once-grand Italian Renaissance building named after this neighborhood in the east end of Pittsburgh. All of the elders in his neighborhood matriculated here, but it's been closed for 34 years, its terrazzo floors now littered with asbestos. Over the door, letters are blocked in yellow paint: know thyself.

Marshall's videographer focuses his lens, framing him in front of the school. Three years ago, when Marshall got out of treatment for borderline personality disorder, he began taping a documentary. The videographer has been with him ever since. In this scene -- meeting the property owner to discuss redeveloping the school -- Marshall explains why he hasn't been in touch sooner. "I'm just now getting right" is how he puts it.

This neighborhood was once home to myriad shops and bakeries and Italian immigrants, but gradually it lost almost 90 percent of its population, leaving behind empty lots and one of the poorest census tracts in Pittsburgh. Marshall moved to Florida in fourth grade, but most of his extended family is still here. He loves coming home and wants to help transform Larimer into a livable area. But it's not a good place for him to stay for too long. It's not just the risk of getting caught in someone else's trouble. "When we look at how the disorder presented itself in me," he says, "a lot of it comes from here."

Following his diagnosis three years ago, Marshall, now 30 and a Pro Bowl wide receiver for the Chicago Bears, set an ambitious goal: become for mental health what Magic Johnson is for HIV. He wants to make an off-limits subject commonplace. He's reaching out to players who might need help, teaming with mental health organizations through his charity and raising awareness and cash for early-detection programs. "Where we are now is where the HIV community was 25 years ago," he says. "We can raise all the money in the world, but people might not go get help. They're still going to see it as a taboo topic. So it's important for us to get the conversation started."

In July 2011, Marshall called a news conference to announce the diagnosis of BPD. Three months earlier, his wife, Michi, had been arrested and Marshall had been hospitalized after an argument. Police said Michi had stabbed him with a kitchen knife in self-defense; the two later said he was cut by broken glass. Out of respect for his marriage, he wouldn't share details, he told reporters, but he wanted them to know that his wife was no villain. He remembered her looking up at him from the back of a police car, pain in her eyes, and saying, "Someone will learn from this story."

That January, Marshall had started seeing Dr. John Gunderson, director of psychosocial and personality research at McLean Hospital near Boston, but he'd given up on therapy. After the incident, Gunderson emailed him: "I heard, now call me and we can see where we can go from here." Still, Marshall was unmoved until his agent and assistant staged an intervention. "They said, 'Brandon, we really want you to go back,'" he says. "I prayed on it and said, 'OK, I will go.'"

He underwent a clinical evaluation, followed by a neurological one, then got his diagnosis: borderline personality disorder. BPD is characterized by emotional outbursts, impulsiveness and difficulty maintaining stable relationships. It can cause wild fluctuations between idealization and vilification -- loving and hating those closest to a person. "I can't articulate well enough how I've affected the people around me, the No. 1 person being my wife," Marshall said at the news conference announcing his condition.

He told the assembled media about the techniques he'd learned in therapy. One of them, radical acceptance, taught him to accept the world as it is. Everything bad he'd ever done, everything bad ever done to him, any time he'd hurt someone or been hurt -- he learned to practice letting go. To treat himself and others with compassion. To stop trying to change the past. "I'm not saying I'm cured, but I'm confident with the skills that I have learned," he said.

Other NFL players have come forward about mental illness -- social anxiety (Ricky Williams), depression (Eric Hipple), bipolar disorder (Erik Ainge) -- but Marshall's statement in 2011 was genuinely trailblazing. Other than memoirist Susanna Kaysen (Girl, Interrupted), the only public figure to declare a diagnosis of BPD has been Dr. Marsha Linehan, developer of one of its most respected treatments.

Marshall has acknowledged that some see his disclosure of the diagnosis as an attempt to excuse his past behavior. "I'm making myself vulnerable, and I want it to be clear that this is the opposite of damage control," he said in 2011. BPD is far less understood than other disorders, and some therapists won't work with patients who suffer from it, owing to the unpredictable and challenging behavior that it causes.

Marshall's story defies the easy redemption and recovery narrative that can characterize sports stories about mental illness when the primary victim is the sufferer. In his case, others suffered greatly. In 2009, ESPN's Outside the Lines detailed at least seven police reports stemming from alleged cases of domestic violence involving Marshall and Rasheedah Watley, his then-girlfriend. They included audio from two 911 calls. In one, Watley phones from a taxi that Marshall is blocking; she screams, "He's crazy, he's attacking the car!" After another altercation in 2007, Watley received stitches for a knife wound. A friend who took Watley to the hospital frantically told a 911 operator that Marshall had rammed her car and was approaching with a brick. She cried for police: "Where are they? He's f---ing crazy!"

The stomach-churning stories of violence happened even as Marshall established himself in the NFL, setting a league record with 21 catches in a game as a Bronco in 2009. His teams struggled to work with him too. Denver suspended Marshall in 2009 for his behavior at practice -- walking instead of jogging, knocking down a pass he was supposed to catch. In 2010, he went to the Dolphins, where he butted heads with QB Chad Henne. In 2012, he was traded to the Bears for a pair of third-round picks. No one questioned his talent, but his behavior sometimes stretched the limits of understanding or even empathy.

"This is the most stigmatized disorder out there," he said during his news conference. "Please tell this story in a way that will help others."

"MY BUDDY WHO just got killed, Mich?" Marshall taps a finger on the passenger-side window. "This was where he got killed, right here in this parking lot. Sitting in his car. Two weeks ago."

Marshall believes his borderline personality disorder was triggered by the stresses of his NFL career. Marcus Smith for ESPN

They're near Brandon's boyhood home, where he witnessed at a young age the same sorts of domestic disputes that would later surface in his relationships. An hour earlier, they had eaten at a restaurant in a redeveloped part of Pittsburgh's east end. Michi asked Brandon to say grace. "We are rooted and grounded by our faith," she says. "We have a story to tell, and we have people to help and work to do. We don't have to prove our hearts are genuine about this. The only thing we need to do is be transparent. That's something that comes naturally -- and it gives people an open door to ask for help."

Not long after he left McLean, Marshall invited his extended family to his grandmother's home in Larimer for a barbecue. The event was part family reunion, part sociology experiment: Marshall wanted to observe how his family interacted. While he believes that his BPD was triggered by the stresses and pressures of a career in the NFL, he also thinks that he's a product of his environment.

"From my grandmother to my aunts and uncles, to me, my cousins and our children ... I noticed that our temperaments, how we communicated, how we dealt with conflict was the same. There was no such thing as validating."

A year later, Marshall recounted that reunion in front of 400 attendees at a National Education Alliance for Borderline Personality Disorder conference. The audience offered sympathetic laughs. Mental health care providers know that many people with BPD have experienced some kind of familial or personal trauma. They also knew what he meant by "validating" -- the concept in dialectical behavior therapy that helps patients learn how to accept and acknowledge what they or their loved ones are feeling without necessarily agreeing with or reacting to them. Marshall warmed up the room by displaying the skills he'd learned in therapy to soothe his vulnerability about public speaking: "I can play in front of 70,000 people, but in a small setting -- this is small to me -- I get butterflies every time. So I'm going to be mindful that I'm nervous right now. I'm going to radically accept it." He paused a moment to focus on a single point and gather his thoughts, then shared some of his writing from therapy.

"Lately, death seems near," he wrote. "I'm 27 years old and if that day came soon it'd be marked as a tragedy -- not because I'm Brandon Marshall, pro football player, but because I wasted an opportunity to be a shining light on this world, and I spent my time here blowing out flames."

There is no magic pill that treats BPD and only a few that help symptoms. Marshall never took any of them, choosing instead to undergo a form of psychotherapy that includes meditation and more traditional cognitive behavioral therapy. People with BPD may try to condition their brain over time to control the intensity of their emotions. Some may come to see it as a chronic condition that requires periodic or regular care.

In 2012, a woman claimed Marshall punched her during a brawl at a New York club. He says he was trying to get Michi, who'd been struck by a bottle, away from the melee and denies hitting anyone. Police declined to press charges, citing a lack of evidence. It has been his only reported run-in with the police since his diagnosis. Marshall is still in the process of proving to himself and the world that he's a different man, and that could take a lifetime.

Now he speaks with the conviction of a man who's had a revelation: This disease, which causes so much pain, can be a gift -- a way to reach people, to empathize deeply and maybe prevent others from experiencing what he has.

"I figured it out when I was in the outpatient program at McLean," Marshall says. "I found that there was more to life, more to me. I went from patient to provider. I was like, 'This is where I'm supposed to be working.'"

In the year after his diagnosis, Marshall did a PSA for the NEA-BPD and founded Project Borderline to educate the public about the disorder. He started the Brandon Marshall Foundation to raise awareness about broader mental health issues and provide resources to prevention and treatment programs. And he visited Congress to help push for the Mental Health in Schools Act after headlining the first-ever Kennedy Forum, a mental health summit, last fall. Joe Biden spoke, followed by Marshall -- who teased the VP about his long-windedness before turning to 450 members of the mental health community and declaring: "This is my team."

Marshall sported lime-green cleats in Week 6 last season to raise awareness of mental health. Mike DiNovo/USA TODAY Sports

Marshall has also taken his message to the field. Last October he wore lime-green cleats -- the color the mental health community uses to promote its cause -- during a game. When the NFL fined him $10,500, he tweeted the letter from the league notifying him about it with the caption: "Football is my platform not my purpose. This fine is nothing compared to the conversation started & awareness raised."

He has used his platform to talk about how mental health issues play out in the NFL. When the Jonathan Martin-Richie Incognito bullying story dominated headlines last year, Marshall issued a statement commending Martin's strength in coming forward. "This is where we grow. Conflict is where the opportunity lies," he says.

So it's no surprise that he has become someone whom people around the league turn to when mental illness affects them. A prominent player pulled him away from the cameras at a game to tell him that he too suffered from mental illness; another later told Marshall that he was bipolar; coaches have approached him before games to say their wives or loved ones had suffered. "We focus so much on all of the bad behaviors, but we ignore the guys who are suffering in silence," he says. "I think there are more guys suffering in silence in the NFL than there are people you can see."

HOW MANY of them suffer? These young men who become overnight millionaires and sudden celebrities -- how many of them go undiagnosed at the age when mental illness begins to present itself?

Brandon Marshall was one of them. So was Davone Bess.

Last season, Bess' first with the Browns after five years with Miami, his friends sensed that something was going terribly wrong in the wide receiver's world. His game had slipped, and Bess dropped nine passes, third worst in the league. In January Bess tweeted a photo of a package containing what appeared to be marijuana. The next day, he was arrested on charges of assaulting a police officer at Fort Lauderdale International Airport. According to the report, Bess was walking through the airport concourse "acting irrationally" -- singing and dancing with his pants falling down. When an officer approached him, Bess allegedly crushed a cup of coffee on him, then took off his shirt and got into a fighting stance. Bess, who appeared to be unstable and on drugs, was taken into custody. The next day another photo -- of Bess nude standing in front of a mirror -- appeared on his Twitter feed.

Marshall had plenty to celebrate on the field last year, scoring 12 TDs to earn his fifth Pro Bowl nod. Mike DiNovo/USA TODAY Sports

That same day, the Miami Herald reported that police had been called to Bess' home the previous March. They found Bess agitated and incoherent, screaming, "Where is my weed?" and "I want to get in the end zone; throw me the football!" It took six officers to restrain him. Alarmed by his conduct, his family had him hospitalized against his will. That April, Miami traded him to the Browns.

Bess was more than just a troubled athlete who was acting out; he was someone who really needed help. Before the incident at the airport, Bess says he had just ended his relationship with his father, who he said was extorting him. His younger brother had recently survived being shot. His marriage was falling apart, and he and his wife were considering divorce. The foundation he founded to help children was failing -- only 6 percent of the proceeds they'd raised had gone to charity -- so he fired the staff. The stresses kept compounding, "and I never got help, I never talked to anybody about any of these problems," says Bess. Except Marshall, his former teammate with the Dolphins.

The two of them sat down together in Florida several times and talked about everything. Bess had his own rough upbringing story -- he grew up in Oakland; his brother's dad, the only father figure in his life, was a drug dealer; at age 10 he witnessed the murder of an uncle. He went to juvenile detention for several months before college. During therapy, he realized he had never really taken the time to account for all the trauma he had experienced in his life -- his coping mechanism had always been to keep plowing through.

Something Marshall said to Bess during their meeting stuck with him: "Little brother, you've got to look at it like this," Bess recalls him saying. "Even though you're going through these tough times right now, there are a lot more people in this world who are hurting and going through similar situations but don't have resources you have." Bess realized that his pain could be used for a higher purpose.

Bess was diagnosed with depression after his arrest and is now in therapy. He's still working out. He says he's not angry at the Browns for releasing him. His agent is calling around, looking for new opportunities, but there is some understandable concern from teams about his mental health. "It's tough being on pause, not knowing what the next move is," says Bess. Like Marshall, he's filming a documentary that he hopes will help other people in similar circumstances. "I want to be able to go that same route and help people who went through similar situations as me," says Bess.