<P> Al MacKenzie was born in Austin, Texas . He was once the C.I.A. liaison to S.H.I.E.L.D. He became romantically involved with Contessa Valentina Allegra di Fontaine after a while, which led to an estrangement between him and Nick Fury . Because of this, he returned to the CIA with the Contessa . </P> <P> MacKenzie later joined the S.H.I.E.L.D. organization full - time, and spent considerable time as the senior liaison officer to the C.I.A. Subsequently, under unknown circumstances, MacKenzie resigned from S.H.I.E.L.D., and wrote a "tell - all" book entitled UnSHIELDed: an Unauthorized Insider's Look Behind the World's Most Powerful Global Spy Network, which purportedly explained some of the history behind the organization from his point of view . Since then, he also acted as an unofficial source to Ben Urich, prodding Urich and Jessica Jones to attempt to expose Fury's unauthorized mission to Latveria . </P> <Ul> <Li> Alphonso "Mack" Mackenzie appears in the TV series Agents of S.H.I.E.L.D., portrayed by Henry Simmons . He is depicted as an African - American mechanic and engineer who is recruited into the newly rebuilt S.H.I.E.L.D. by Phil Coulson after the events of the film Captain America: The Winter Soldier . He is also old friends with Barbara "Bobbi" Morse . In the episode "One of Us," it is revealed that he and Bobbi are secretly associated with "the real S.H.I.E.L.D." led by Robert Gonzales . Later he permanently sides with Coulson . At the time when Inhumans have been emerging in the world, Mack started to develop a relationship with an Inhuman named Elena "Yo - Yo" Rodriguez . The episode "Watchdogs" introduces Mack's brother Ruben Mackenzie (portrayed by Gaius Charles) who later discovers his brother's job as S.H.I.E.L.D. even at the time when the Watchdogs raid Mack's house upon mistaking him for an Inhuman . In season 4 episode "Wake Up", Mack is revealed to be in constant pain due to the loss of his daughter Hope who died as an infant four days after birth due to an unstable and unidentified medical condition . In the episode "Identity and Change," Mack is shown in the Framework to have Hope Mackenzie (portrayed by Jordan Rivera) alive in there . He is forced to leave by Yo - Yo when the Framework begins to fall apart . <Ul> <Li> Simmons reprises his role in a six part web series titled Agents of S.H.I.E.L.D.: Slingshot . </Li> </Ul> </Li> </Ul> <Li> Alphonso "Mack" Mackenzie appears in the TV series Agents of S.H.I.E.L.D., portrayed by Henry Simmons . He is depicted as an African - American mechanic and engineer who is recruited into the newly rebuilt S.H.I.E.L.D. by Phil Coulson after the events of the film Captain America: The Winter Soldier . He is also old friends with Barbara "Bobbi" Morse . In the episode "One of Us," it is revealed that he and Bobbi are secretly associated with "the real S.H.I.E.L.D." led by Robert Gonzales . Later he permanently sides with Coulson . At the time when Inhumans have been emerging in the world, Mack started to develop a relationship with an Inhuman named Elena "Yo - Yo" Rodriguez . The episode "Watchdogs" introduces Mack's brother Ruben Mackenzie (portrayed by Gaius Charles) who later discovers his brother's job as S.H.I.E.L.D. even at the time when the Watchdogs raid Mack's house upon mistaking him for an Inhuman . In season 4 episode "Wake Up", Mack is revealed to be in constant pain due to the loss of his daughter Hope who died as an infant four days after birth due to an unstable and unidentified medical condition . In the episode "Identity and Change," Mack is shown in the Framework to have Hope Mackenzie (portrayed by Jordan Rivera) alive in there . He is forced to leave by Yo - Yo when the Framework begins to fall apart . <Ul> <Li> Simmons reprises his role in a six part web series titled Agents of S.H.I.E.L.D.: Slingshot . </Li> </Ul> </Li>

Who plays mac's brother on agents of shield