"Many authors have examined the effect of various control mechanisms on firm value, but have devoted little attention to the effect of these mechanisms on firm risk. This paper studies the effect of different variables related to the power of the chairman and chief executive officer (CEO) on firm risk in Spain. Decisions taken by both the chairman and the CEO are very important in order to attain the shareholders' objectives. Thus, decisions relative to both posts can be considered very relevant from the human resources point of view. There is little previous empirical evidence on this topic, and what there is comes from the US. Most results are consistent with what we call a 'power perspective'. That is, we observe a positive relation between firm risk and combining in the same person the positions of chairman of the board and CEO. We also find a positive relation between firm risk and the status of both leaders as founding partners, and a negative relation between firm risk and board size."

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