Gerard Baden-Clay has Mercury in the zodiac sign of Virgo (it’s all in the details, man) and resides in the second house of his chart (the money/values house). It is not surprising that, as a young man, he should choose to study accountancy.
In relation to Mercury aspects in his birth chart Baden-Clay has a quindecile aspect (see the navigation menu) between Mercury (in Virgo) and a minor planet, Chiron (in Aries). I would not normally bring a minor planet into a profile unless it were in such a position as this. Chiron is recognised as ‘the wounded healer’ and in astrological terms has strong karmic meaning (the place where we can heal our wounded selves.)
Chiron shakes us according to our character, as revealed through the symbols of the natal chart. A person with strong Mars will more than likely turn to violent action, or aggressive behaviour in order to avoid the truth; someone with strong Venus will smother in pleasure; one who has a powerful Moon may become drug or alcohol affected; Jupiter will turn to gambling; Saturn to overwork and so on for all the planetary types.
Mercury in Virgo would indicate a neurotic obsession with the details of his thoughts, words or ideas. The Chiron in Aries is fiery and associated with Mars, the planetary ruler of Aries. Baden-Clay has Mars in a strong position in relation to his ego, however Mars discussion is for another day.