Transformers are an essential part of our life. They often go unnoticed for many years, until something goes wrong, then power is cut off, production stops with significant damages to all parties involved. Yet a lot can be done (before and after transformers are manufactured) to prevent getting to this point. My direct, multi disciplinary experience of several years is at the service of both transformer manufacturers and users to support them in preventing costly failures. If a failure already happened, then I can help you finding its causes and the measures to get safely back in service.