Mark R Walter vs Thomas Callan

Mark R Walter vs Thomas Callan

Mark R Walter is a venture capital based in Chicago, Illinois, United States. Thomas Callan is a individual/angel based in Chicago, IL, United States.

• Investor type: Mark R Walter — Venture Capital; Thomas Callan — Individual/Angel
• Headquarters: Mark R Walter — Chicago, Illinois, United States; Thomas Callan — Chicago, IL, United States

• Mark R. Walter — Venture Capital · Chicago, Illinois, United States · Mark R Walter portfolio
• Thomas Callan — Individual/Angel · Chicago, IL, United States · Thomas Callan portfolio

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