AH lawyers are recognized for their legal expertise. A number of them are internationally acknowledged as leaders in their fields, but all are highly regarded for their commerciality, astuteness and tenacity. As the Chambers Global worldwide lawyers guide has put it, the firm is renowned for advising on "the difficult matters".

The legal issues upon which many of their clients seek their assistance cannot be solved with “the usual answer”. Their practice approach emphasizes independent and creative thinking to come up with a legal solution which is both intelligent and commercial.

AH partners are directly involved in all matters, working closely with clients in small focused teams of experienced lawyers. This can be contrasted with the practice style of some of their national competitors, whose business model requires them to staff their matters with large numbers of junior inexperienced lawyers to deliver maximum leverage.