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Once you complete the quest, he will go back to your camp and unlock a new upgrade menu when you find and speak to him. Just follow the main story missions until you reach the First City and get the quest to rescue Dr.
![crit chance rifle mods crit chance rifle mods](https://cdn.fanbyte.com/wp-content/uploads/2019/01/Warframe-Mod-Rarity-1024x576.jpg)
Once you complete the quest, he will go back to your camp and unlock a new upgrade menu when you find and speak to him. Just follow the main story missions until you reach the First City and get the quest to rescue Dr.