Professor Edward J. (Ted) Cowan

 Professor Edward J. Cowan FRSE (Fellow Royal Society of Edinburg) is a Scottish historian, currently Director of the University of Glasgow's Dumfries Campus and Professor of Scottish History and Literature. According to Wikipedia his main research interests are with the history of Viking Scotland, the Scottish Wars of Independence, Early Modern Scottish Political Thought, the Covenanters, Scottish Emigration history and the Scots in the Arctic and Pacific North West. A lengthy list of publications (including articles) are available on that web site. 
Professor Cowan has published and edited several books on Scottish history.

One of the books he has written is a biography of James Graham, the 1st Marquess of Montrose. Professor Cowan was presented with an honory membership to The 1st Marquis of Montrose Society last year and he spoken at their events.
Professor Cowan is also involved with the upcoming 700th anniversay of the Battle of Bannockburn.

Colquhouns mentioned in Montrose Society article

This is from an article published in Venture Faire (Issue No. 17 December 2012) published by The 1st Marquis of Montrose Society . International membership is available from the Society. 

 Montrose's Sisters: An Account by Phinella Henderson

"In June 1620 her[Lilias (1596 -1650) was the eldest daughter of John, fourth Earl of Montrose]

  marriage contract with Sir John Colquhoun of Luss was signed. Colquhoun, the sixteenth laird of Colquhoun and eighteenth of Luss, must have appeared a very suitable choice. The Colquhoun lands in Dunbartonshire were close to Graham lands and Sir John was about the same age as Lilias. He had just returned from his Grand Tour of Europe which had included time in Heidelberg, where he may have acquired his manservant, the apparently unsavoury Thomas Carlippis. The couple were married on 6 July 1620 at Mugdock near Glasgow; Lilias had a dowry of £10,000. Colquhoun was created a baronet of Nova Scotia in August 1625. Over the years they had six children; John, James, Alexander, Jean, Lilias and Catharine...." The rest of the article is here: http://www.montrose-society.org.uk/pdf/VENTURE%20FAIRE%20-%202012%20Website.pdf