Scotland's Power100 - 41-50

41 Calvin Harris

He started out recording bedroom demos as a teenager in Dumfries but, now 30, the singer, songwriter, DJ and remixer Calvin Harris has sold millions of records and been the highest-earning DJ for two years in a row as named by Forbes.

The winner of Grammys, MTV VMA awards and a coveted Ivor Novello, he broke a UK record last year by having nine top 10 singles from one album.

He has collaborated with Rihanna, Dizzee Rascal, Florence Welch and Ellie Goulding.

Unfortunately he had to pull out of hosting the recent MTV European Music Awards in Glasgow due to "heart problems".

Least likely to say: "There's not enough guitar on this track."

42 Katherine Garrett-Cox

The chief executive and chief investment officer of Alliance Trust in Dundee, Garrett-Cox, 47, was once dubbed "Katherine the Great" for keeping on top of a demanding career as a fund manager while being mother to four children.

Her company now manages billions of pounds' worth of assets and Garrett-Cox, formerly chief executive of Aberdeen Asset Management Ltd, sits on the Prime Minister's business advisory group. She is also vice-chair and trustee of the charitable Baring Foundation.

Watch out for: A rising profile -Garrett-Cox is still young.

43 Sir John Leighton

The director-general of the National Galleries of Scotland, Belfast-born Sir John, 55, has overseen some significant developments, including securing for the nation Titian's Diana and Actaeon and Diana And Callisto.

The £100 million acquisitions were pursued jointly with the National Gallery in London.

The Edinburgh fine art graduate and former director of the Van Gogh Museum in Amsterdam has overseen record visitor numbers, the reopening of the Scottish National Portrait Gallery and the securing of the major contemporary art collections of Anthony d'Offay.

Watch out for: Re-housing the Scottish collection of pictures at the National Gallery.

44 Joanna Baker

Managing director of the Edinburgh International Festival for the last eight years, the 54-year-old is affable but steely.

With previous experience at Scottish Ballet and Sadler's Wells, she also makes a considerable contribution to the festival's dance programme, but never takes her eyes off the event's finances.

Greatest achievement: She has helped make the fireworks display at the end of the festival the must-go-to event it has become (it now attracts around a quarter of a million people).

45 Sir Chris Hoy

Britain's most successful Olympic athlete, with six gold medals to his name, Edinburgh-born and bred Sir Chris, 38, is a keen advocate of cycling for health and as a mode of transport.

He was knighted in 2009, an unusual accolade for an active sporting figure.

Sir Chris, who recently became a father for the first time when his son Callum was born 11 weeks prematurely, is an active ambassador for the charity Scottish Association for Mental Health (SAMH).

Greatest single achievement: Probably taking three golds at the Beijing Olympics.

46 Mona Siddiqui

One of the country's most recognised and respected intellectuals, Siddiqui, 51, is Professor of Islamic and Interreligious Studies at the University of Edinburgh having taught at Glasgow University for 15 years.

One of her major areas of interest is Christian-Muslim relations, but you will also recognise her voice from the most high-profile religious slot in British broadcasting: Radio 4's Thought for the Day.

Watch out for: Siddiqui talking about her new book My Way: A Muslim Woman's Journey.

47 Professor Anton Muscatelli

The principal and vice-chancellor of Glasgow University is less outspoken than he once was on educational policy (in 2010, he warned that the university would run out of cash within three years).

But the 52-year-old economist remains influential as an advisor to government and was a central figure in the arguments over the pros and cons of an independent Scotland, arguing that a currency union between Scotland and the rest of the UK would have been good for both sides.

Watch out for: His influence growing as president of the David Hume Institute.

48 Janet Archer

As the chief executive officer of Creative Scotland, the body which decides which Scottish arts organisations should receive funding and which should not, 54-year-old Archer has enormous influence.

The recent Scottish Youth Theatre funding wrangle, for example, became extremely controversial.

Creative Scotland is also working on plans for a new film studio in Scotland, and, although many in the industry will believe it when they see it, Archer has said she is confident it will happen.

Watch out for: World War Z II.

49 Sir Peter Housden

As Permanent Secretary to the Scottish Government, Sir Peter, 63, is the principal policy adviser to the First Minister and the leader of the 5000 civil servants who will be closely involved in creating further devolution for Scotland and making it work.

His influence at the top of Scottish Government is beyond question, but his neutrality has sometimes been doubted, with opposition parties accusing him of becoming too close to the SNP and the fight for independence.

Most likely to say: "Yes, First Minister."

50 Bridget McConnell

She helped deliver the Commonwealth Games to Glasgow and now, as chief executive of Culture and Sport Glasgow, 56-year-old McConnell, who is married to the former first minister Jack McConnell, has a leading role in helping to deliver the games' legacy.

She leads a staff of 2,600 and controls an annual budget approaching £100 million, although her influence extends from sports to the arts: she is a fellow of the Royal Society of Arts.

Least likely to say: "I don't see the point of sport."