Hello @mcjensen,
Thanks for writing in! Are you using Pro theme? You can only add a custom content in your portfolio page by doing the following:
1.) Duplicate your global custom header.
2.) The newly duplicated header will need to be assigned as the header of the portfolio page.
3.) Go to Pro > Global Blocks and create a block that will have your Photographers photos and short bios.
4.) Take note of the Global Block shortcode,
5.) Edit the newly duplicated header and add another bar. You will have to insert a text or content area element and then use the global block shortcode.
For more details about the steps above, please check the documentation:
Hope this helps.