POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby consti-
tutes and appoints each of Marcy S. Rathman and Louis T. Petrillo
the undersigned's true and lawful attorney-in-fact to:
(1)  execute for and on behalf of the undersigned, in the under-
signed's capacity as an officer and/or director of Arch Capital
Group Ltd. and/or one of its subsidiaries (the "Company"), Forms
3, 4 and 5 (or any analogous form), including amendments, in ac-
cordance with Section 16(a) of the Securities Exchange Act of 1934
and the rules thereunder;
(2)  do and perform any and all acts for and on behalf of the un-
dersigned which may be necessary or desirable to complete and exe-
cute any such Forms 3, 4 and 5 (or any analogous form) and timely
file such form with the United States Securities and Exchange Com-
mission and any stock exchange or similar authority; and
(3)  take any other action of any type whatsoever in connection
with the foregoing which, in the opinion of such attorney-in-fact,
may be of benefit to, in the best interest of, or legally required
by, the undersigned, it being understood that the documents exe-
cuted by such attorney-in-fact on behalf of the undersigned pursu-
ant to this Power of Attorney shall be in such form and shall con-
tain such terms and conditions as such attorney-in-fact may ap-
prove in such attorney-in-fact's discretion.
The undersigned hereby grants to each such attorney-in-fact full
power and authority to do and perform any and every act and thing
whatsoever requisite, necessary, or proper to be done in the exer-
cise of any of the rights and powers herein granted, as fully to
all intents and purposes as the undersigned might or could do if
personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or
such attorney-in-fact's substitute or substitutes, shall lawfully
do or cause to be done by virtue of this power of attorney and the
rights and powers herein granted.  The undersigned acknowledges
that the foregoing attorneys-in-fact, in serving in such capacity
at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934.
This Power of Attorney shall remain in full force and effect until
the undersigned is no longer required to file Forms 3, 4 and 5 (or
any analogous form) with respect to the undersigned's holdings of
and transactions in securities issued by the Company, unless ear-
lier revoked by the undersigned in a signed writing delivered to
the foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of At-
torney to be executed as of this 7th day of June 2021.
/s/ Christine Todd
Signature
Christine Todd
Print Name