Piers Steel

加拿大卡尔加里大学教授，时间动机理论提出者，做了拖延领域最重要的元分析，写了《拖延方程式》。

原始来源

• The nature of procrastination: A meta-analytic and theoretical review of quintessential self-regulatory failure.
  Psychological Bulletin · 2007 · 论文
• Integrating Theories of Motivation
  Academy of Management Review · 2006 · 论文
• Irrational Delay Revisited: Examining Five Procrastination Scales in a Global Sample
  Frontiers in Psychology · 2017 · 论文