My latest book, "Ruthless Prioritization," offers an approach that will help you take back your day and move from being a reactive person to a proactive one. I use each pillar, and it has helped guide me every working day to understand what is important and what tasks can wait.
Time management is a learnable skill, and in this completely revised edition, Morgenstern provides the ultimate tools to combine, delegate, and eliminate unnecessary tasks, put technology to work, and stop procrastinating once and for all. Understanding which tasks are high-level versus low-level can help you define what to move to the top of your list, delegate, or defer to others.
There are numerous books on time management, however "Ruthless Prioritization" provides you with real tools that you can use together that are tried and true.