How to write formula that states how many open tasks a person has based on another field being blank

I am still learning Smartsheet and formulas so please bear with me lol...

I am trying to show in the Sheet Summary report that counts the number of open tasks each one of our validation engineering techs have. Ideally I want to this information to be pulled from the column [Validation Tech/Engineer] and the # of open tasks would be when [Work Completed] field is still blank

so far I have this as the formula. But I do not know how to get the if blank portion to work

=COUNTIFS([Validation Tech/Engineer]:[Validation Tech/Engineer], "Bob Smith")

Thank you!

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