New Liberal Democrat leader Sir Menzies Campbell has named Sarah Teather as his education spokesman, in the final shake-up of his frontbench team.
Ms Teather's new job is seen as a promotion
Ms Teather, who at 29 was the youngest MP when she won the Brent East by-election in 2003, had been the party's local government spokesman.
Former education spokesman Ed Davey receives the trade and industry brief.
Susan Kramer gets the international development role, while 26-year-old Jo Swinson will speak on Scottish issues.
Leadership rival Simon Hughes remains as party president and shadow attorney general, but also takes on constitutional affairs.
Alistair Carmichael gets the transport brief and Nick Harvey defence.
LIB DEM RESHUFFLE
Home affairs - Nick Clegg
Foreign affairs - Michael Moore
Treasury - Vincent Cable
Health - Steve Webb
Environment - Chris Huhne
Education - Sarah Teather
Trade and Industry - Ed Davey
International Development - Susan Kramer
Scotland - Jo Swinson
Transport - Alistair Carmichael
Defence - Nick Harvey
Deputy Treasury spokeswoman - Julia Goldsworthy
Office of the Deputy Prime Minister - Andrew Stunell
Meanwhile, Andrew Stunell, the party's chief whip, will speak on Office of the Deputy Prime Minister matters.
Sir Menzies, who has now completed his reshuffle, said he was "delighted" to have such "a formidable parliamentary team".
"I am determined that we will continue to develop a modern, forward looking liberal agenda," he said.
"I have now put in place the team to carry that message forward. Only the Liberal Democrats can provide the value-based policies and approach that the British electorate are crying out for."
Sir Menzies has already named Nick Clegg, a key backer of his leadership campaign, and only an MP since last year, as home affairs spokesman.
Defeated leadership rival Chris Huhne gets the environment brief and Michael Moore gets foreign affairs.
Vincent Cable retains his post as Treasury spokesman, while Julia Goldsworthy is made his deputy and Steve Webb stays with health.
Ms Teather, now 31, has been a rising star since her shock win of the one-time Labour stronghold of Brent East in 2003.
Within a month she was promoted to the frontbench as a junior spokeswoman on health issues.
LEAVING THE FRONTBENCH:
She took over as the speaker on London when Mr Hughes was appointed party president in 2004.
Ms Teather, who joined the party while still a student at St John's College, Cambridge, in 1993, marked out education as a key issue during last year's general election.
New international development spokesman Ms Kramer stood as the Lib Dems London mayoral candidate in the 2000 election.
She later accepted a place on the Transport for London Board under Ken Livingstone's administration.
At 26, Ms Swinson, who was only elected last May, becomes the youngest frontbench spokesperson in the House of Commons.