Question:
Which employer did Peiter Zatko work for in Jul, 2010?

Context:
 Peiter Zatko works for Twitter, Inc. from Jan, 2020 to Jan, 2022. 
 Peiter Zatko works for Google from Jan, 2013 to Jan, 2020. 
 Peiter Zatko works for DARPA from Jan, 2010 to Jan, 2013.

Answer:
DARPA