- Bird watching Liam met Dr. Helen B. Taussig in woods behind her house. Dr. Taussig, known as "the blue baby doctor", was emeritus at Johns Hopkins Medical University, Baltimore. She hired Liam as her personal assistant during last two years of his college studies. Dr. Taussig, Presidential Medal of Freedom recipient and founder of Pediatric Cardiology, was a pioneer proponent of open heart surgery.
- Liam's maternal great grandmother Emily Thomas is first cousin to Metropolitan Opera baritone John Charles Thomas. John Charles, as his family called him, grew up in Cumberland, Maryland.
- Actor William H. Macy and Liam graduated same year from different high schools in Cumberland, Maryland. Both actors have worked for director Paul Thomas Anderson.
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