Marcus Specter is Harvey's younger brother. He had a gambling addiction.
- Harvey got involved with Charles Forstman 12 years before the series started due to Marcus asking for money for his second chance, a restaurant. As of Not Just a Pretty Face, he doesn't know that the money had been dirty.
- He appears in flashback in Faith when Harvey is telling his therapist about his parents. He blamed Harvey for destroying their family.
- He appears in The Painting at his father's funeral in flashback and has the first appearance in the present. He threatened Harvey after admitting that Lily was there and would say a few words. He tells Harvey that it was time to let it go.
- After Harvey approached him in the present, he invited him to stay at Marcus' home with his family.
- He has a daughter who likes Pinkalicious.
- Marcus had been sick where he needed chemo twice in his life: once when Harvey was younger and once when Harvey wasn't speaking to his mother.