Quincy Dunn-Baker William Kamkwamba Sean Biggerstaff Trywell Kamkwamba Matthew Noszka Agnes Kamkwamba Zahn McClarnon Annie Kamkwamba Christian Galvis Chief Wembe Matt Walton Mike Kachigunda Paget Brewster Edith Sikelo Kevin Costner Eliot Ness Sean Connery Jim Malone Robert De Niro Al Capone Charles Martin Smith Oscar Wallace Andy García George Stone Richard Bradford Mike Jack Kehoe Payne Brad Sullivan George Billy Drago Nitti Patricia Clarkson Ness' Wife Vito D'Ambrosio Bowtie Driver Don Harvey Preseuski Robert Swan Mountie Captain Del Close Alderman Greg Noonan Rangemaster Mike Bacarella Overcoat Hood Michael P. Byrne Ness' Clerk Larry Brandenburg Reporter Chelcie Ross Reporter Clem Caserta Bodyguard Kevin Costner Eliot Ness Sean Connery Jim Malone Robert De Niro Al Capone Charles Martin Smith Oscar Wallace Andy García George Stone Richard Bradford Mike Jack Kehoe Payne Brad Sullivan George Billy Drago Nitti Patricia Clarkson Ness' Wife Vito D'Ambrosio Bowtie Driver Don Harvey Preseuski Robert Swan Mountie Captain Del Close Alderman Greg Noonan Rangemaster Mike Bacarella Overcoat Hood Michael P. Byrne Ness' Clerk Larry Brandenburg Reporter Chelcie Ross Reporter Pat Billingsley Bailif Will Zahrn Defense Attorney Valentino Cimo Bodyguard Joe Greco Bodyguard Clem Caserta Bodyguard Robert Miranda Gunned Head John Barrowman Street Person (uncredited) Stephen Burrows Hoodlum (uncredited) Eddy Donno Capone's Hitman (uncredited) Collin Hymes Baby in Carriage (uncredited) Clifton James District Attorney (uncredited)