You can do this using SharePoint Designer. There is an action item in SPD as 'Email this message'. In this option, when you click on the 'To' field, you are prompted with a list of options and groups that already exist within your site.

There are 2 options here,

1. You can select the option of 'user who created the current item' if the Author column value also has the current user who created the item.

2. There is also an option to create a workflow lookup, which will pick all columns from your current list. Since you have defined the Author column as a people picker, this column would not be picked by SPD in the Workflow items list. Here also, you have a created by or modified by column to pick up the user who has modified the item.

Please refer this link for more details.

Hope this helps. :)

You can do this using SharePoint Designer. There is an action item in SPD as 'Email this message'. In this option, when you click on the 'To' field, you are prompted with a list of options and groups that already exist within your site.

There are 2 options here,

1. You can select the option of 'user who created the current item' if the Author column value also has the current user who created the item.

2. There is also an option to create a workflow lookup, which will pick all columns from your current list. You can either pick up the Author column in the Workflow items list or you have a created by or modified by column to pick up the user who has modified the item.

Please refer this link for more details.

Hope this helps. :)