Other forms: rainmakers
If someone has a reputation as a rainmaker at work, it means that she has an almost uncanny ability to generate new business, attract clients, gather investments, or otherwise help the company succeed.
This figurative meaning of rainmaker is the most common, especially in the business world. Rainmakers have a magic touch, or extremely good luck. It's as though everything they're involved with at work helps their employer make money. The original sense of rainmaker is literally "person who makes the rain fall," and you can also use it for a Native American leader of ritual rain dances or a scientist who seeds clouds to make rain fall.