I’m saying ‘You need to send someone to fix my lock.’ All of a sudden, there was a policeman on my porch. And I thought, ‘This is strange.’ So I went over to the front porch still holding the phone, and I said ‘Officer, can I help you?’ And he said, ‘Would you step outside onto the porch.’ And the way he said it, I knew he wasn’t canvassing for the police benevolent association. All the hairs stood up on the back of my neck, and I realized that I was in danger. And I said to him no, out of instinct. I said, ‘No, I will not.’

My lawyers later told me that that was a good move and had I walked out onto the porch he could have arrested me for breaking and entering. He said ‘I’m here to investigate a 911 call for breaking and entering into this house.’ And I said ‘That’s ridiculous because this happens to be my house. And I’m a Harvard professor.’ He says ‘Can you prove that you’re a Harvard professor?’ I said yes, I turned and closed the front door to the kitchen where I’d left my wallet, and I got out my Harvard ID and my Massachusetts driver’s license which includes my address and I handed them to him. And he’s sitting there looking at them.

Now it’s clear that he had a narrative in his head: A black man was inside someone’s house, probably a white person’s house, and this black man had broken and entered, and this black man was me.

So he’s looking at my ID, he asked me another question, which I refused to answer. And I said I want your name and your badge number because I want to file a complaint because of the way he had treated me at the front door. He didn’t say, ‘Excuse me, sir, is there a disturbance here, is this your house?’—he demanded that I step out on the porch, and I don’t think he would have done that if I was a white person.

But at that point, I realized that I was in danger. And so I said to him that I want your name, and I want your badge number and I said it repeatedly.

TR: How did this escalate? What are the laws in Cambridge that govern this kind of interaction? Did you ever think you were in the wrong?

HLG: The police report says I was engaged in loud and tumultuous behavior. That’s a joke. Because I have a severe bronchial infection which I contracted in China and for which I was treated and have a doctor’s report from the Peninsula hotel in Beijing. So I couldn’t have yelled. I can’t yell even today, I’m not fully cured.

It escalated as follows: I kept saying to him, ‘What is your name, and what is your badge number?’ and he refused to respond. I asked him three times, and he refused to respond. And then I said, ‘You’re not responding because I’m a black man, and you’re a white officer.’ That’s what I said. He didn’t say anything. He turned his back to me and turned back to the porch. And I followed him. I kept saying, “I want your name, and I want your badge number.”

It looked like an ocean of police had gathered on my front porch. There were probably half a dozen police officers at this point. The mistake I made was I stepped onto the front porch and asked one of his colleagues for his name and badge number. And when I did, the same officer said, ‘Thank you for accommodating our request. You are under arrest.’ And he handcuffed me right there. It was outrageous. My hands were behind my back I said, ‘I’m handicapped. I walk with a cane. I can’t walk to the squad car like this.’ There was a huddle among the officers; there was a black man among them. They removed the cuffs from the back and put them around the front.

A crowd had gathered, and as they were handcuffing me and walking me out to the car, I said, ‘Is this how you treat a black man in America?’