The late Leonard Nimoy wrote two memoirs with interlocking titles – "I Am Not Spock" and "I Am Spock." His literary works could be a case study in a marketing communications branding class.
Being type-cast in Hollywood is not always a good thing. Recognizing you are type-cast can be liberating. Nimoy became famous as Mr. Spock, the split-fingered Vulcan sage who could see logic in chaos. The role that catapulted him to fame became his cage, which he first rejected, but ultimately accepted.
The lesson behind Nimoy's transformation is that customers decide your brand, not you.
Rebelling against your "brand" is why many brand extensions often fail – e.g. Colgate TV dinners and Evian's water-filled bra. You are who your customers think you are, not who you think you are. The better known the brand, the more you are, well, type-cast.
When Nimoy came to grips with his situation and accepted his branding, he directed two of the six Star Trek movie take-offs. He lent his voice to a cartoon version of the popular TV series. And he branched out to photography, poetry and music.
Brands can expand if you stay grounded in what the brand is expected to be. Starbucks came up with a home coffee-making machine. Orville Reddenbacher sells ready-to-eat popcorn. Duracell offers a power mat for mobile devices. Nestlé Crunch teamed with the Girl Scouts to produce a cookie candy bar.
Much energy and expense is devoted to "branding." A good place to begin is asking your customers or clients to describe your brand. You may be surprised at what they tell you. If customers are unsure of what you do, you have one kind of branding problem. If they tell you what they like about what you do, you have a golden opportunity to keep doing it.