Today's digital agency landscape is hyper-competitive. With swift shifts in technology, changing privacy laws, the sharp rise of new platforms and competitive disruptors, it's more challenging than ever to maintain an agency's success. For perspective on this topic, we speak with former digital agency president and partner Mitch Joel about his experience building, running and selling agency Twist Image (to WPP). Joel shares his thoughts on meeting client expectations, managing talent, assessing revenue models, and more.