<Li> Evan Roe as Jason McCord, Elizabeth and Henry's teenage son, a self - proclaimed anarchist . Jason is very critical of political systems in general, however in season 1 he was expelled from his school for punching a student who insulted Elizabeth . </Li> <Li> Keith Carradine as Conrad Dalton (season 2--present; recurring season 1), the President of the United States . Before going into politics, Conrad was the Director of the Central Intelligence Agency during Elizabeth's time at the CIA . In "Unity Node", he reveals that he served in the United States Marine Corps as a second lieutenant during the Vietnam War . In the third season, Dalton secures reelection as an independent after failing to secure his party's nomination, partly due to a controversial change in policy championed by Elizabeth McCord . He offers Elizabeth the role of Vice President during his campaign, but eventually names someone else in order to further his campaign . Elizabeth remains Secretary of State . </Li> <Li> Sebastian Arcelus as Jay Whitman, Elizabeth's current chief of staff and previous senior policy advisor (season 3--present; recurring season 1--2). In season 3, it is revealed that Jay's busy schedule working for the Secretary has strained his marriage . He is currently separated from his wife Abby, who maintains custody of their daughter Chloe . Jay is promoted to chief of staff in season 4 . </Li> <Ul> <Li> Sara Ramirez as Kat Sandoval, Elizabeth's Policy Advisor and Former Chief of Staff to the UN Ambassador (season 4) </Li> <Li> Johanna Day as Ellen Hill, a retired admiral and the National Security Advisor . She was the first female Chairwoman of the Joint Chiefs of Staff prior to being appointed National Security Advisor . </Li> <Li> Tony Plana as Ed Parker, an admiral and member of the Joint Chiefs of Staff . </Li> <Li> Francis Jue as Ming Chen, China's Foreign Minister and Elizabeth's Chinese counterpart . </Li> <Li> Mandy Gonzalez as Lucy Knox, President Dalton's aide . </Li> <Li> Mike Pniewski as Gordon Becker, the United States Secretary of Defense . </Li> <Li> Kevin Rahm as Michael "Mike B ." Barnow, a political official who is said to drift between the United States Cabinet departments . It is mentioned that he is a Rhodes Scholar, who turned his brilliant legal career into a promising political career that was cut short by a scandalous divorce six years prior to his first appearance before settling into his current job . He is often seen assisting Secretary McCord . </Li> <Li> Jason Ralph as Harrison Dalton (season 1--2), son of President Dalton and long - time friend of Stevie McCord . In season 1, it is revealed Harrison has a drug addiction and is color blind . In season 4 it is revealed that he is back in rehab . </Li> <Li> Cotter Smith as Darren Hahn (season 1--2), President Dalton's first known National Security Advisor . </Li> <Li> Patrick Breen as Andrew Munsey (season 1), the Director of the CIA and a protégé of President Dalton . </Li> <Li> Nilaja Sun as Juliet Humphrey (season 1; guest season 3), a former CIA analyst, friend and colleague of Elizabeth and Isabelle . </Li> <Li> Usman Ally as Zahed Javani (season 1), Iran's Foreign Minister and Elizabeth's Iranian counterpart . </Li> <Li> Dion Graham as Fred Cole (season 1), the Bureau of Diplomatic Security Head Agent who served as Elizabeth's principal bodyguard . </Li> <Li> Josh Hamilton as Arthur Gilroy (season 1), Stevie's 39 - year - old microloan employer and ex-boyfriend . </Li> <Li> Anna Deavere Smith as Mary Campbell (season 1), the United States Attorney General . </Li> <Li> Marin Hinkle as Isabelle Barnes (season 1), a CIA analyst and Elizabeth's close friend, who assists the McCords with the investigation of the death of Secretary of State Vincent Marsh . </Li> <Li> Yorgo Constantine as Anton Gorev (season 1--2), Russia's Foreign Minister and a friend of both Secretary and Dr. McCord . </Li> <Li> Clifton Davis as Ephraim Ware (season 2--present), Director of National Intelligence . </Li> <Li> Julian Acosta as Craig Sterling (season 2), a former US Department of Defense official, he becomes National Security Advisor in season 2 much to Elizabeth and Russell's dismay, and rival of Elizabeth's . </Li> <Li> Alex Fernandez as Mark Delgado (season 2), the Vice President of the United States . </Li> <Li> Angela Gots as Maria Ostrova (season 2), the President of Russia and widow of late Russian President Pavel Ostrov . </Li> <Li> Leslie Hendrix as Louise Cronenberg (season 2), the United States Attorney General . </Li> <Li> Jill Hennessy as Jane Fellows (season 2), Henry's DIA superior, and a member of Murphy Station; the first Ishbal Jahed task force . </Li> <Li> Kobi Libii as Oliver Shaw (season 2; guest season 3), the Cybersecurity Coordinator . Shaw looked into the attack against Air Force One and is the love interest of Daisy Grant in the second season . </Li> <Li> Chris Petrovski as Dmitri Petrov (seasons 2 & 4; guest season 3), a 24 - year - old Russian Army captain who studied at the National War College . He was recruited by Professor Henry McCord (on behalf of the DIA) to become an American spy in exchange for getting his sick sister medical care in Stockholm, Sweden . Dmitri is captured by the Russians and eventually exchanged to the Americans for another traitor to the state . Following his capture Dmitri feels abandoned by Henry and is very angry and bitter toward him . He is placed into a witness protection program under the name Alexander (Alex) Mehranov . In season 4, he gets recruited by the CIA as an analyst . </Li> <Li> Masha King as Talia Petrov, Dmitri's sister who was placed into witness protection with her brother and is now his roommate . </Li> <Li> Carlos Gómez as Jose Campos (season 2--3), an Ishbal Jahed task force member . </Li> <Li> J.C. MacKenzie as Sam Evans (season 3), the governor of Pennsylvania and the presidential nominee for Dalton's party . Evans is particularly vindictive during the campaign and, following Dalton's victory through a vote in the House of Representatives, threatens to have the vote overturned due to little - known law he claims Elizabeth broke . However, he is manipulated into accepting the terms of the vote after Russel Jackson threatens to expose him for having a gene that makes him likely to develop early - onset Alzheimer's . </Li> <Li> René Auberjonois as Walter Novack (season 2--present), a State Department analyst with the Bureau of International Security and Nonproliferation . </Li> <Li> Christopher O'Shea as Jareth Glover, Stevie's fiance from England . He gave up a fellowship at Oxford to return to America to be with Stevie after she had trouble adjusting to life in England . His family is a member of the upper class and even nobility in England . Stevie and Jareth broke up in season 4 . </Li> <Li> Justine Lupe as Ronnie Baker (season 3), a United States Army captain assigned to United States Cyber Command who assists Elizabeth on several occasions . </Li> <Li> Eric Stoltz as Will Adams, Secretary Elizabeth McCord's younger brother and a member of Doctors Without Borders . </Li> <Li> Jordan Lage as Kohl, a United States Army general . </Li> <Li> Sam Breslin Wright as Dylan Larson, an ex--Army Ranger who has been working for the CIA for seven years as of the start of season 4 . </Li> <Li> Christine Garver as Molly Reid, a career CIA agent, starting her career as a field agent in Chechnya . She is pregnant and due in a couple months from the start of season 4 . </Li> </Ul>

What is jay's job on madam secretary