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Dear Ms. Craven,
Thank you for posting your request on History Hub!
We suggest that you being your family research by reviewing NARA’s web pages on genealogy at https://www.archives.gov/research/genealogy
Also we conducted a preliminary search on ancestry.com and it produced 62 possible files on Christopher Theis. Many of these records are not in the custody of the National Archives but you may view these records online at one NARA's facilities for free via ALIC. For the nearest NARA location, please consult our web page at https://www.archives.gov/locations/. Many more records for a Christopher Theis where located using familysearch.org which is a free research site.
We hope this information is helpful. Best of luck with your family research!