A few recent titles that will help anyone be more effective:
Essentialism: The Disciplined Pursuit of Less by Greg McKeown. The Way of the Essentialist isn’t about getting more done in less time. It’s about getting only the right things done. It is not a time management strategy, or a productivity technique. It is a systematic discipline for discerning what is absolutely essential, then eliminating everything that is not, so we can make the highest possible contribution towards the things that really matter.
Your Brain at Work by David Rock. Strategies for overcoming distraction, regaining focus, and working smarter all day long - based on research on the brain's functions, limitations, and capacities.