A question is nibbling away at my focus needed to complete my work. I have joined this forum in order to understand the market and come across a few exalted individuals. I find a few individuals who like to help others out and have offered their support openly. I appreciate their nobility. There is no successful author without a brilliant editor, who will keep picking up the flaws in arguments and complexity of sentences. One just can't say enough about the need for a brilliant editor - an often unsung person who toils without tiring, one who is simultaneously supportive and critical. Do we have the honour of having among us an editor who has done one, if not several, book that has sold in the excess of ten thousand copies in the market? I would like to have the honour of knowing a few active in this forum. I would also like to know what inspires them to toil so hard for others' work. Some real insights directly from those brilliant, unsung individuals please... There are editors who do fiction exclusively, then there are some who do non-fiction. Is there a commonality between the two genre? Is being highly aware and knowledgeable in the field(s) which the work he/she will potentially be editing is based on, an absolute pre-requisite for him/her? Should these be ascertained before he/she is to be handed over the project? Your free/frank opinion is solicited.