My late grandfather, Saul Kaye, was among the millions of Brooklyn kids raised by hardworking immigrant parents. He came of age during the Depression, studied hard, served in the U.S. Army during World War II, and spent his postwar years doing his part to build America into a powerhouse, while building a respectable middle-class life for his family. (You've heard similar stories before.)

What's less typical about his story, however, was that my grandfather became one of the World's Leading Experts In Something. A chemist and inventor, he knew everything there was to know about one tiny subject: How to use a particular gas compound to sterilize hospital and lab equipment. Saul spent most of his career working for and consulting to private companies such as chemical and equipment manufacturers, despite never having earned a Ph.D. He became an expert mainly due to his work, not his study.

Today, in my own work with experts, Saul's story reminds me of a few truths about expertise. Two are Old Truths, and one is a New Truth:

OLD TRUTH #1: Expertise Comes In Many Specialties and Sizes. Saul's specialty knowledge mattered only to a small number of people and chemical firms. But it mattered intensely to those folks. The importance of most experts can't be measured by the number of people who've heard of them. There are millions of niche-but-important topics, each containing its own World's Leading Experts.

OLD TRUTH #2: Formal Credentials Tell Us Less Than We Think. Much has been written about famous successful college dropouts. Less has been written about the people we've worked with whose value cannot be measured by their formal credentials. Each of us knows someone like my grandfather who may lack the most fancy credentials, yet is extremely smart and important to his or her colleagues and clients. (Chances are that we revere that person.)

NEW TRUTH: We're In The Golden Age of Experts. There's simply never been a better time to be an expert in something. We can see this in a few important ways:

• There's a huge need for specialty knowledge - things that not everyone knows or can quickly pick up - and that need is growing geometrically. Specialty knowledge cuts across all professions and job types, from the technical to the interpersonal. Everyone needs specialty knowledge - whether they're an employee, a consultant, a business owner, or a student trying to land his or her first job.
• It's easier than ever for experts to engage with audiences, for mutual benefit. The web allows niche communities to self-organize and thrive quickly. Experts can, at very little cost, teach and guide their way toward a large following. For the experts' followers, there are now countless ways to learn from experts.

If you're a World's Leading Expert In Something (anything!) it's time to stake your claim. Your formal credentials don't matter as much as you think. You can find people who not only want, but need to learn from you. You may simply need to start engaging in new ways. What's your particular expertise? Team CredSpark would like to hear from you - feel free to comment below or email us: experts@credspark.com.

Image: Saul Kaye, 1950's