Johnny Marcone is a human crime boss, often known as Gentleman Marcone. He first appears in Storm Front.
Johnny Marcone controls the majority of organized crime in Chicago. Marcone crosses paths frequently with Harry Dresden throughout the series. Marcone is very protective of his people. If one dies in the line of duty or is killed, he invariably exacts retribution.
Harry Dresden describes him as having short, salt and pepper hair. He had sun-hardened smile-lines, he had green eyes like old dollar bills. Marcone was good-looking, tanned athletic, and enthusiastic. He seemed more like a football coach than a crime boss. In "Even Hand", it has been hinted that Johnny Marcone isn't his real name.
Occasionally Marcone displays a characteristic that keeps him from being lumped together with every other evil, hungry predator. For his own reasons, Marcone would go to extreme lengths to help and protect children. For his business, any adult is fair game but kids are off limits. He's vanished every one of his employees that ever crossed the line. He also discreetly cares for Amanda Beckitt who is permanently hospitalized in a coma. 
He is a Freeholding Lord under the Unseelie Accords.  Marcone is on the board of directors of Chicago Historical & Art Society. He owns Executive Priority Health. He organized the Brighter Future Society and built headquarters for the Chicago Alliance. 
He seems to have some respect for Harry Dresden, and acknowledges his power. Throughout the series, despite the disrespectful and insulting way Harry talks to him, Marcone never goes beyond threats and, usually helps Harry on the latter's terms. In Aftermath, when insultingly confronted by William Borden and Karrin Murphy, he throws a silver knife directly into Will's shoulder while Hendricks points a gun at them, bluntly telling them to watch their tongues as they did not have the power that Dresden had.
- Main article: White Night
In White Night, it's revealed that Marcone became a threat to Tony Vargassi and Marco Vargassi. In an attempt to take him out, Amanda Beckitt was shot. Marcone took over the Chicago-underworld from under Vargassi family's rule, 2 years prior to the events of Storm Front. The whole story is told like a mini-movie when Harry Soulgazed with Ms. Demeter (Helen Beckitt) at his club: Executive Priority Health.
- Main article: Even Hand
In "Even Hand", Marcone is shown that, under certain conditions, he is able of taking down a sorcerer.
In the series Edit
- Main article: Storm Front
In Storm Front, Marcone's stops Harry Dresden to buy him off the Jennifer Stanton case. While in the car, Harry soulgazed him accidentally and sees that he's like a tiger and will kill when necessary. Overall he runs the underground of Chicago effectively, profitably, and ruthlessly. Later, Harry tracks Gimpy, who stole his hair, to The Varsity where Marcone and Hendricks are. Gimpy refuses to show his wrist where Harry scratched him, Hendricks shoots him.
- Main article: Fool Moon
In Fool Moon, Marcone tries to hire Harry Dresden as head of security. This was presumably a countermeasure to the threat of the Loup-garou. Marcone had been working against the Northwest Passage Project. Marcone provided this information in an attempt to preserve his life. In an attempt to stop the killings, Harry Dresden instigates a big showdown on Marcone's Estate between himself with the Alphas and Tera West, the FBI Hexenwolves and Harley MacFinn in Loup-garou form, and Marcone with Hendricks.
- Main article: Death Masks
In Death Masks, Marcone's Chicago Historical & Art Society is holding a fundraiser at the Marriott Downtown Chicago Hotel. Harry, Susan Rodriguez and Martin suspect that this is where the Shroud of Turin is going to be sold by the Churchmice smuggler, Anna Valmont. Susan and Harry go. While there, they get introduced to his new security consultant Miss Gard. Harry guesses that Marcone is the buyer for the Shroud.
Later, Marcone provides helicopter transportation to follow the Denarian infested train to St. Louis. He assists the Knights of the Cross and recovers the Shroud of Turin in order to attempt the resuscitation of Amanda Beckitt. It is revealed that he harbors great regret for her current state. Her status is implied to be one of the motivations for his 'no children' rule.
- Main article: Dead Beat
In Dead Beat Marcone appears in the nick of time to save Harry Dresden from the Corpsetaker. In the process he challenges fate. He provides information and drops Harry off at Cook County Hospital to investigate the survival of one of his 'mortally wounded' men.
- Main article: White Night
In White Night, Marcone becomes the first normal human Freeholding Lord under the Unseelie Accords. Two of his three required signatures come from Harry Dresden, representative of the White Council and Monoc Securities. He does this by aiding in the fight at the White Court Deeps. His new status allows him to better defend himself against the supernatural threats of the Dresdenverse.
- Main article: Small Favor
In Small Favor some downsides of Marcone's new position as a Freeholding Lord are demonstrated. He is kidnapped by Denarians and held under tortuous conditions. He is later rescued and leaves Demonreach by way of helicopter flown by Gard playing "Ride of the Valkyrie".
- Main article: Changes
In Changes, Marcone makes a brief appearance where he meets Harry at a Burger King to discuss information in regards to the location of Harry's daughter Maggie.
- Main article: Ghost Story
In Ghost Story, it's mentioned in passing in that, for reasons not revealed, Marcone has gone to Italy. However, he has constructed a building called Brighter Future Society—a combination residence-armory-headquarters-daycare center for those Chicagoans fighting supernatural threats—on the location of Harry Dresden's former residence. Gard, Hendricks, Marcone and all of his troubleshooters have alibis at the time of Harry's shooting.
- Main article: Cold Days
In Cold Days, the Brighter Future Society was Lara Raith's idea but Marcone imported the Castle which was built of Harry's old apartment site. Lara tried to seduce Marcone but he kept it strictly business. Marcone was the second man to turn Lara down in a century—Harry was the other—Lara was miffed.
- Main article: Skin Game
- ↑ 1.0 1.1 Dead Beat, ch. 18
- ↑ 2.0 2.1 Storm Front, ch. 3
- ↑ Changes, ch. 22
- ↑ 4.0 4.1 Death Masks, ch. 33
- ↑ 5.0 5.1 5.2 White Night, ch. 43
- ↑ 6.0 6.1 Death Masks, ch. 16
- ↑ 7.0 7.1 White Night, ch. 22
- ↑ 8.0 8.1 Ghost Story, ch. 16 and 18
- ↑ White Night, ch. 29
- ↑ Storm Front, ch. 17
- ↑ Fool Moon, ch. 10
- ↑ Fool Moon, ch. 28-33
- ↑ Death Masks, ch. 19
- ↑ Changes, ch. 20
- ↑ Ghost Story, ch. 18
- ↑ Cold Days, ch. 19