Recommended reading for marketers and leaders: #ExtremeOwnership by Jocko Willink. I highly recommend this book on leadership by a former Navy SEAL Commander. Some of the key takeaways from this book for me were:
Extreme Ownership – as the leader you are responsible for everything that goes on with your team/department.
Your ego is your enemy - stay humble.
You need to believe in the mission – or product or marketing campaign.
Keep your communication clearly, concise, and simple.
Lead up and down the chain of command – providing insight and information to both those who report to you as well as those you report to.
Decentralize Command – aka delegate to get the best out of your team and to help them grow as leaders.
Proper planning is key – successful campaigns, product rollouts, etc. start with solid planning and analysis.
Prioritize - there is never enough dollars and/or manpower to get everything done that you want to. Prioritize based on those things that will get you the most positive outcome with the least effort.