David Marshall is a senior full-stack developer and project lead at the Harvard School of Public Health. With more than 10 years of experience building websites and web applications on the WordPress platform, his particular focus is on modern design and functionality, user experience, and ease of navigation., David Marshall is a senior full-stack developer and project lead at the Harvard School of Public Health. With more than 10 years of experience building websites and web applications on the WordPress platform, his particular focus is on modern design and functionality, user experience, and ease of navigation.