Defendant-appellant Hector Rodriguez (“Rodriguez” or “defendant”) appeals from the entry of a default judgment against him in the amount of $91,294.38 plus interest. We affirm.
I.
RELEVANT PROCEDURAL AND FACTUAL BACKGROUND
On June 6, 1990, the Puerto Rico law firm of Goldman, Antonetti, Ferraiuoli, Axtmayer & Hertell (“GAFAH”) 1 filed a complaint against Rodriguez, Randy Smith (“Smith”), George and Lorin Croce, and *688 Medfit International, Inc. (“Medfit”), seeking payment of legal fees totalling $101,-294.38. 2 The complaint alleged that defendants had breached an agreement with Ferraiuoli, Axtmayer & Hertell (“GAFAH’s predecessor firm”) calling for plaintiff to provide defendants with professional legal services relative to the formation, development, and financing of a latex glove manufacturing business. 3
Subsequently, Rodriguez moved to dismiss the complaint pursuant to Rules 4(e) and 12(b)(l)-(7) of the Federal Rules of Civil Procedure. After reviewing the record, the district court treated Rodriguez’s motion as a motion for summary judgment, and denied it on May 8, 1991.
On August 2, 1991, the district court issued a scheduling order setting a pretrial and settlement conference for November 14, 1991, and a bench trial for December 16, 1991. That order warned the parties that any failure to comply with its provisions could result in the imposition of sanctions under Fed.R.Civ.P. 16(f). This warning was repeated in an October 18, 1991, order which rescheduled the pretrial and settlement conference to November 15, 1991. 4 Despite these warnings, Rodriguez failed to appear for the November 15,1991, pretrial and settlement conference. Consequently, the district court entered a partial judgment dismissing Rodriguez’s counterclaims and cross-claim. 5
On January 17, 1992, Rodriguez telephoned the district court’s chambers to notify the court that he would not appear for the January 21, 1992, trial. Rodriguez did not, however, request a continuance or provide the court with a valid justification for his anticipated absence. Accordingly, when Rodriguez failed to appear for trial, the district court found that he was in default. The district court then held a bench trial on the question of damages, and determined that plaintiff was entitled to recover $91,294.38 plus interest from Rodriguez and the previously defaulted Smith and Medfit. The district court found all three defendants jointly and severally liable for this judgment.
II.
DISCUSSION
On appeal, Rodriguez makes three principal arguments: (1) that the district court erred in failing to grant his motion to dismiss; (2) that the district court abused its discretion in dismissing his counterclaims and cross-claim; and (3) that the district court abused its discretion in entering default judgment against him. 6 We discuss each argument in turn.
*689 A. Rodriguez’s Motion to Dismiss
Rodriguez first challenges the district court’s denial of his motion to dismiss, arguing that the district court erroneously relied on certain allegations contained in Jose A. Axtmayer’s unsworn statement signed under penalty of perjury to find: (1) that a genuine, material factual dispute existed over the substance of the oral fee agreement; (2) that Rodriguez was subject to the in personam jurisdiction of the district court; and (3) that MPPR was not an indispensable party under Fed.R.Civ.P. 19(b). We disagree with Rodriguez’s contentions.
1. Standard of Review
There is no dispute that Rodriguez’s motion to dismiss was properly treated as a motion for summary judgment.
See
Fed. R.Civ.P. 12(c). Appellate review of a district court order denying a motion for summary judgment is plenary.
Federal Deposit Ins. Corp. v. World Univ. Inc.,
2. The Unsworn Statement
Axtmayer’s unsworn statement signed under penalty of perjury was submitted in support of plaintiff’s opposition to Rodriguez’s motion to dismiss. 7 Rodriguez argues that the district court’s reliance on the allegations contained in Axtmayer’s unsworn statement constitutes an abuse of discretion because the statement fails to conform to the requirements of Fed. R.Civ.P. 56(e). We disagree.
Under federal law, an unsworn statement signed under penalty of perjury may be used, in lieu of a sworn statement or affidavit, to support or oppose a motion for summary judgment.
See
28 U.S.C. § 1746;
8
see also Pfeil v. Rogers,
757 F.2d
*690
850, 859 (7th Cir.1985) (holding that an affidavit failing to satisfy the “technical, non-substantive requirements of execution” may be considered as part of a party’s opposition to a motion for summary judgment provided the affidavit complies with 28 U.S.C. § 1746),
cert. denied,
3. In Personam Jurisdiction
As noted, Rodriguez also challenges the district court’s ruling that it had personal jurisdiction over him. In so doing, Rodriguez first contends that the district court should not have considered the allegations in Axtmayer’s statement when it decided the question of
in personam
jurisdiction.
9
However, Rodriguez’s argument is undermined by the fact that a district court may go beyond the four corners of the pleadings and consider materials presented in support of a motion to dismiss for lack of
in personam
jurisdiction.
See American Express Int'l, Inc. v. Mendez-Capellan,
Rodriguez’s attack on the merits of the district court’s ruling is equally unavailing. “It is well established that in diversity cases, ‘the district court’s personal jurisdiction over a nonresident defendant is governed by the forum’s long-arm statute.’ ”
Pizarro v. Hoteles Concorde Int'l, C.A.,
Here, there is undisputed record evidence that Rodriguez initiated and personally participated in the negotiations which
*691
led to the fee agreement which is the subject of this litigation, and that at least some portion of these negotiations took place at GAFAH’s predecessor firm’s offices in Puerto Rico. Thus, it is clear that Rodriguez is subject to the reach of 4.7(a)(1) and that the cause of action arose out of Rodriguez’s action in the forum state. Furthermore, the record reveals that Rodriguez was personally and continuously involved in plaintiff’s efforts to assist in the formation, development, and financing of MPPR, which was to be a Puerto Rico corporation.
11
This fact, when coupled with Rodriguez’s solicitation and subsequent retention of plaintiff, leaves little doubt that Rodriguez purposefully availed himself “of the privilege of conducting activities within the forum ..., thus invoking the benefits and protections of its laws.”
Hanson,
4. Rule 19(b)
Finally, Rodriguez argues that the district court erred in refusing to grant his motion to dismiss on the basis of plaintiff’s failure to join MPPR as a non-diverse indispensable party under Fed.R.Civ.P. 19(b). 12 This argument does not require extended discussion.
The district court ruled that because defendants and the non-diverse MPPR were alleged to be jointly and severally liable for the legal fees owed plaintiff, joinder of MPPR was not mandatory, but was merely permissive. The district court’s ruling on this issue is patently correct.
See Temple v. Synthes Corp., Ltd.,
B. Dismissal of Rodriguez’s Counterclaims and Cross-claim
As a result of Rodriguez’s failure to appear at the scheduled pretrial and settlement conference, his failure to prepare a pretrial order, and his failure to otherwise comply with the court’s orders, the district court dismissed with prejudice Rodriguez’s counterclaims and cross-claim. The dismissal was premised upon Fed.R.Civ.P. 16(f). 13 Rodriguez claims that the district court’s imposition of these sanctions constitutes an abuse of discretion. Again, we disagree.
As an initial matter, we note that “[t]he proper performance of the case-management function requires that the trial court be allowed great latitude in applying Rule 16(f).”
Veranda Beach Club v. Western Surety Co.,
We also recognize that “ ‘dismissal with prejudice is a harsh sanction which runs counter to our strong policy favoring the disposition of cases on the merits.’ ”
Marx v. Kelly, Hart & Hallman, P.C.,
As detailed above, the district court issued two separate orders which notified the parties as to the date and time of the November 15, 1991, pretrial and settlement conference. In addition, both orders provided explicit warnings to the parties that failure to comply could result in the imposition of sanctions under Fed.R.Civ.P. 16(f). Despite ample notice and repeated warnings, Rodriguez did not attend the pretrial and settlement conference. Nor did he provide the court with either proper notice that he would not appear or a compelling justification for his absence. As such, we cannot say the district court abused its discretion in construing Rodriguez’s absence as “a willful disregard of the Court’s procedure and time” and therefore dismissing his counterclaims and cross-claim. 14
C. Default Judgment
On February 28, 1992, the district court entered default judgment against Rodriguez for his failure to appear at trial. Rodriguez challenges this order, arguing that the entry of default constitutes an abuse of discretion both because (1) the district court failed to give him notice pursuant to Fed.R.Civ.P. 55(b)(2), and (2) plaintiff failed to prove its case on the merits at trial. 15 Here too, Rodriguez’s arguments are unavailing.
In pertinent part, Fed.R.Civ.P. 55(b)(2) provides: “[If] the party
against whom judgment by default is sought
has appeared in the action, the party ... shall be served written notice
of the application for judgment
at least 3 days prior to the hearing on such application.” (Emphasis supplied). By its very terms, therefore, Rule 55(b)(2) does not apply where, as here, there is no motion for default pending and where the court has, on its own motion, found a party to be in default for a failure to appear. Pertinent authority supports
*693
such a construction of the Rule.
See Anilina Fabrique de Colorants v. Aakash Chemicals and Dyestuffs, Inc.,
Rodriguez also argues that the entry of default against him was an abuse of discretion because plaintiff failed to prove its case on the merits at trial. Defendant’s argument ignores the maxim that an entry of a default against a defendant establishes the defendant’s liability.
See Brockton Savings Bank v. Peat, Marwick, Mitchell & Co.,
III.
CONCLUSION
For the foregoing reasons, the challenged district court orders are affirmed.
Affirmed. Double costs to appellee. 17
. We award double costs in response to appellee's well-grounded request for sanctions under Fed.R.App.P. 38.
Notes
. GAFAH was the original plaintiff in this case. However, plaintiff-appellee Goldman, Antonetti, Ferraiuoli & Axtmayer ("GAFA” or "plaintiff') was substituted for GAFAH after Hertell left the partnership in September of 1990.
. Default was subsequently entered against Smith and Medfit for failure to answer the complaint. The action against George and Lorin Croce was dismissed with prejudice, pursuant to Fed.R.Civ.P. 41(a)(1), after they agreed to pay plaintiff $10,000.00 towards the legal fees due. None of these defendants is a party to this appeal.
. More specifically, plaintiff claims that it agreed to render professional services on an hourly fee basis, and that its fees would be payable by Rodriguez and Smith personally “until such time as financing was obtained” for their latex glove manufacturing project. Rodriguez, on the other hand, contends to have entered into an oral fee agreement with plaintiff on behalf of Medfit Products Puerto Rico, Inc. (“MPPR”). Rodriguez also claims that the agreement set forth a contingent fee arrangement, “said contingency being the successful financing and closing of the proposed latex glove project[,]“ and denies that he is or ever was personally responsible for payment of the legal fees owed to plaintiff.
. The district court later continued the December 16, 1991, trial date until January 21, 1992.
. In so doing, the district court also took note of Rodriguez’s failure to prepare a pretrial order and his failure otherwise to comply with its orders.
.
Rodriguez also litters his brief and reply brief with one-sentence allegations of error that are accompanied by neither argument nor supporting authority. Time and time again, we have warned litigants that "issues raised in a perfunctory manner, unaccompanied by some effort at developed argumentation, are deem waived.” See,
e.g., Elgabri v. Lekas,
. Axtmayer’s statement alleges, inter alia, that Rodriguez and Smith retained GAFAH’s predecessor firm to represent them in connection with the establishment of a latex glove manufacturing facility in Puerto Rico. Axtmayer further alleges that the firm agreed to provide the professional services requested “on a per hour fee basis to be invoiced monthly and payable by Rodriguez and Smith until such time as financing was obtained for the project.” Finally, Axtmayer states that after Medfit Products of Puerto Rico was incorporated in Puerto Rico, Rodriguez and Smith agreed that they, along with Medfit and George and Lorin Croce, "were [the firm’s] clients in their individual capacities and were personally], jointly and severally responsible for the payment of the services rendered and expenses incurred by [the firm] as a result of their representation.”
. In relevant part, 28 U.S.C. § 1746 provides:
Wherever, under any law of the United States or under any rule, regulation, order, or requirement made pursuant to law, any matter is required or permitted to be supported, evidenced, established, or proved by the sworn declaration, verification, certificate, statement, oath, or affidavit, in writing of the person making the same ... such matter may, with like force and effect, be supported, evidenced, established, or proved by the unsworn declaration, certificate, verification, or statement, in writing of such person which is subscribed by him, as true under penalty of perjury, and dated, in substantially the following form:
If executed within the United States, its territories, possessions, or commonwealths: "I declare (or certify, verify, or state) under pen *690 alty of perjury that the foregoing is true and correct. Executed on (date).
(Signature)”.
. Axtmayer's statement asserts that Rodriguez personally initiated the negotiations which led to the representation and fee agreements with GAFAH’s predecessor firm in a 1987 visit to the firm’s offices.
. The Supreme Court has elaborated upon this “minimum contacts” rule:
The application of [the minimum contacts] rule will vary with the quality and nature of the defendant’s activity, but it is essential that there be some act by which the defendant purposefully avails itself of the privilege of conducting activities within the forum state, thus invoking the benefits and protections of its laws.
Hanson v. Denckla,
. These activities took place over a two-year span and allegedly generated the $101,294.38 of unpaid fees and expenses plaintiff is seeking.
. Joinder of MPPR, a Puerto Rico corporation, would have destroyed the district court’s subject matter jurisdiction in this diversity case.
. In pertinent part, Fed.R.Civ.P. 16(f) provides:
If a party or party’s attorney fails to obey a scheduling or pretrial order, or if no appearance is made on behalf of a party at a scheduling or pretrial conference, or if a party or party’s attorney is substantially unprepared to participate in the conference, or if a party or party's attorney fails to participate in good faith, the judge, upon motion or the judge’s own initiative, may make such orders with regard thereto as are just, and among others any of the orders provided in Rule 37(b)(2)(B), (C), (D)....
The orders provided for in Fed.R.Civ.P. 37(b)(2) include orders “striking out pleadings or parts thereof, or staying further proceedings until the order is obeyed, or dismissing the action or proceeding or any part thereof, or rendering a judgment by default against the disobedient party.” Fed.R.Civ.P. 37(b)(2)(C) (emphasis added).
. We do note that on November 14, 1991, at 3:22 p.m., Rodriguez attempted, via telecopier, to file with the district court a motion for an extension of time in which to compromise the controversy. However, the record indicates that defendant’s motion was not actually received and filed by the district court until November 15, 1991, at 3:14 p.m., after the scheduled 2:30 p.m. conference had already taken place. Rodriguez also claims that at the same time he transmitted his motion, he notified the court that he would not be attending the conference scheduled for the following day. However, even were we to credit this assertion, it would not provide us with a sufficient basis for determining that the district court’s actions were an abuse of discretion.
. Rodriguez also objects to the holding of a bench trial despite the fact that he had properly requested a jury trial in his answer. However, “after a default judgment has been entered under Fed.R.Civ.P. 37(b)(2), a party has no right to jury trial under either Fed.R.Civ.P. 55(b)(2), ... or the Seventh Amendment.”
Adriana Int'l Corp. v. Thoeren,
. Our refusal to apply the notice requirement of Rule 55(b)(2) to this case can hardly be viewed as unfair to Rodriguez. Clearly, the purpose of Rule 55(b)(2) is to make certain that a defaulted party is on notice of the possibility that a default judgment might be entered against him/her. Here, Rodriguez admitted in an affidavit to his awareness "that the court had positioned itself to hold [Rodriguez] liable by default or otherwise’’ at the time he failed to appear for trial. Thus, the situation against which Rule 55(b)(2) guards was not present in this instance.
