Phoenix is 16 hours behind Seoul year-round. When it's midnight in Seoul, it's 8:00 AM the previous day in Phoenix. Neither Phoenix nor Seoul observes daylight saving time, so this difference is constant.
Arizona (except the Navajo Nation) does not observe daylight saving time, making the time calculation with Seoul straightforward throughout the year.
Optimal meeting window: 4:00 AM - 6:00 AM Phoenix time (8:00 PM - 10:00 PM Seoul). Very early morning Phoenix catches late evening Seoul.
Phoenix's semiconductor industry has ties to South Korea's tech sector, with Korean companies like Samsung having significant manufacturing presence in Arizona.