Nick B.(link 2) is a Roll20 developer working on many "by Roll20" character sheets, as well as having create a number of sheets directly for publishers.

Sheets

• Warhammer Fantasy Roleplay 4e Official by Cubicle 7
• Mothership by Tuesday Knight Games
• Tales from the Loop by Free League Publishing
• Altered Carbon by Hunters Entertainment
• Teens in Space by Hunters Entertainment