New article by Tim Keller in the new issue of The Movement (Redeemer's church planting newsletter): "Leadership and Church Size Dynamics." This is Part 1 of 2. Read the rest of the issue here.
Also encourage you to read the interview with J.R. Vassar, "Calling and Seduction of the City." He is the planter of Apostles Church in Manhattan, NYC. I met him in my first year of ministry in Colorado when he spoke at a college retreat I organized. Good guy.
In other Redeemer resource news, I noticed a few days ago that Redeemer has a Coaching Urban Church Planters book out from J. Allen Thompson. Should be helpful.