random acts of kindness : Sonja Lyubomirsky, Kennon Sheldon, and David Schkade, “Pursuing Happiness: The Architecture of
Sustainable Change,” Review of General Psychology 9 (2005): 111–131.
overloaded and stressed : Mark C. Bolino and William H. Turnley, “The Personal Costs of Citizenship Behavior: The Relationship
between Individual Initiative and Role Overload, Job Stress, and Work-Family Conflict,” Journal of Applied Psychology 90
(2005): 740–748.
equilibrium : Madoka Kumashiro, Caryl E. Rusbult, and Eli J. Finkel, “Navigating Personal and Relational Concerns: The Quest for
Equilibrium,” Journal of Personality and Social Psychology 95 (2008): 94–110.
visible in our writing : James Pennebaker, The Secret Life of Pronouns: What Our Words Say About Us (New York: Bloomsbury
Press, 2011), 13.
software engineers : Leslie A. Perlow, “The Time Famine: Toward a Sociology of Work Time,” Administrative Science Quarterly 44
(1999): 57–81.
Sean Hagerty : Personal interview (April 26, 2012).
Australian adults : Timothy D. Windsor, Kaarin J. Anstey, and Bryan Rodgers, “Volunteering and Psychological Well-Being among
Young-Old Adults: How Much Is Too Much?” Gerontologist 48 (2008): 59–70.
American adults : Ming-Ching Luoh and A. Regula Herzog, “Individual Consequences of Volunteer and Paid Work in Old Age: Health
and Mortality,” Journal of Health and Social Behavior 43 (2002): 490–509; see also Terry Y. Lum and Elizabeth Lightfoot,
“The Effects of Volunteering on the Physical and Mental Health of Older People,” Research on Aging 27 (2005): 31–55.
diminishing returns : Jonathan E. Booth, Kyoung Won Park, and Theresa M. Glomb, “Employer-Supported Volunteering Benefits: Gift
Exchange Among Employers, Employees, and Volunteer Organizations,” Human Resource Management 48 (2009): 227–249.