I have been saying this for long, and I reiterate that a logo is not the brand. But it's just a visual and external aspect of it. A brand is a lot more on the inside - Authentic, substantial, and dynamic. 
By no means I am trying to undermine the importance of a logo. Instead, I say, when you are seriously supposed to have a logo, as you might feel so, or your strategist advises you to, then go for a strategic one, a conceptual and prominent, yet simple and memorable one.
Here is one such example. We did it for an Interior Design firm based out of Mumbai. 
The name of the company comes from the founder's love for Physics. He appeared to be fascinated by the "Principle of Archimedes." So we based our research and ideation on that very concept and developed the logo. 

The outcome was a classic and minimal yet catchy and memorable logo. We left our client excited and overwhelmed. That's the best reward we can get for any of our work.
 
But then what is a brand?
Leave a feel of your style, wherever you work - that is your brand.