In this issue of The Bridge, guest editors Greg Olson and Aziz Asphahani have assembled feature articles that demonstrate how computational materials science and engineering is leading the way in the deployment of metallic materials that meet increasingly advanced design specifications.

• A Word from The NAE Chair: A Moment for Introspection
• Editor in Chief's Note The Materials Genome Initiative Grows
• Guest Editors' Note Challenges and Opportunities for the US Metals Industry

This issue explores the unique value proposition that engineers and engineering disciplines present in addressing the National Academies’ Grand Challenges. Covering topics ranging from the global sustainability challenge to the sequestration of carbon to transformations in our water management system, the articles in this issue show how engineers are vital to creating a world in which humanity can thrive.

• A Word from the NAE Chair Intelligent Systems Engineering?
• Editor's Note: Welcoming Changes
• Issue Editors' Note Engineers Matter - But Why?

The world’s cities face increasing threats from natural disasters, aging infrastructure, traffic, and resource constraints. The articles in this issue examine smart infrastructure, sustainability, net zero carbon options, and autonomous driving, among other approaches to smart and sustainable cities.

• A Word from the NAE Chair: Infrastructure Here and Abroad
• Guest Editor's Note: Engineering for Sustainable Smart Cities
• A Metastructure Approach to Smart and Sustainable Cities