UpHealth (UPHL) S-4/A Registration of securities issued in business combination transactions (amended)

Exhibit 99.6

April 12, 2021

GigCapital2, Inc

1731 Embarcadero Rd., Suite 200

Palo Alto, CA 94303

Consent to Reference in Proxy Statement/Prospectus

GigCapital2, Inc. (the “Company”) is filing a Registration Statement on Form S-4 with the Securities and Exchange Commission under the Securities Act of 1933, as amended (the “Securities Act”). In connection therewith, I hereby consent, pursuant to Rule 438 of the Securities Act, to the reference to me in the proxy statement/prospectus included in such Registration Statement as a future member of the board of directors of the Company, such appointment to commence upon the effective time of the merger described in the proxy statement/prospectus.

Sincerely,

/s/ Agnès Rey-Giraud

Name: Agnès Rey-Giraud