Exhibit 24
POWER OF ATTORNEY
The undersigned, as a Section 16 reporting person of Alector, Inc.
(the "Company"), hereby constitutes and appoints Arnon Rosenthal, Brian Sander,
Calvin Yu, and each of them, the undersigned's true and lawful
attorney-in-fact, to:
1. prepare, execute in the undersigned's name and on the undersigned's
behalf, and submit to the Securities and Exchange Commission (the "SEC") a
Form ID, including amendments thereto, and any other documents necessary or
appropriate to obtain EDGAR codes and passwords enabling the undersigned to make
electronic filings with the SEC or reports required by Section 16(a) of the
Securities and Exchange Act of 1934 or any rule or regulation of the SeC:
2. complete and execute Forms 3, 4 and 5 and other forms and all
amendments thereto as such attorney-in-fact shall in his discretion
determine to be required or advisable pursuant to Section 16 of the
Securities Exchange Act of 1934 (as amended) and the rules and regulations
promulgated thereunder, or any successor laws and regulations, as a
consequence of the undersigned's ownership, acquisition or disposition of
securities of the Company; and
3. do all acts necessary in order to file such forms with the SEC,
any securities exchange or national association, the Company and such
other person or agency as the attorney-in-fact shall deem appropriate.
The undersigned hereby ratifies and confirms all that said attorneys-
in-fact and agents shall do or cause to be done by virtue hereof. 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 (as amended).
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 with respect
to the undersigned's holdings of and transactions in securities issued by
the Company, unless earlier revoked by the undersigned in a signed writing
delivered to the Company and the foregoing attorneys-in-fact.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney
to be executed as of this 7 day of February, 2022.
Signature: /s/ Marc Grasso
Name: Marc Grasso
